[FIX] models: handle the case of `_constraints` with empty list of field names
[FIX] models: handle the case of `_constraints` with empty list of field names

fuhongliang/odoo,provaleks/o8,Elico-Corp/odoo_OCB,MarcosCommunity/odoo,alqfahad/odoo,odootr/odoo,Endika/odoo,ovnicraft/odoo,dfang/odoo,apocalypsebg/odoo,tangyiyong/odoo,Endika/odoo,markeTIC/OCB,fuhongliang/odoo,minhtuancn/odoo,poljeff/odoo,Antiun/odoo,luiseduardohdbackup/odoo,mlaitinen/odoo,incaser/odoo-odoo,provaleks/o8,dariemp/odoo,microcom/odoo,MarcosCommunity/odoo,BT-ojossen/odoo,bplancher/odoo,ApuliaSoftware/odoo,BT-fgarbely/odoo,BT-rmartin/odoo,alqfahad/odoo,tangyiyong/odoo,shaufi/odoo,rowemoore/odoo,alqfahad/odoo,dalegregory/odoo,acshan/odoo,OpenUpgrade/OpenUpgrade,dsfsdgsbngfggb/odoo,VielSoft/odoo,rubencabrera/odoo,markeTIC/OCB,apocalypsebg/odoo,avoinsystems/odoo,hanicker/odoo,optima-ict/odoo,mlaitinen/odoo,ehirt/odoo,jiangzhixiao/odoo,takis/odoo,NeovaHealth/odoo,hoatle/odoo,takis/odoo,incaser/odoo-odoo,Bachaco-ve/odoo,salaria/odoo,AuyaJackie/odoo,takis/odoo,hoatle/odoo,shingonoide/odoo,fjbatresv/odoo,Maspear/odoo,lgscofield/odoo,dalegregory/odoo,BT-rmartin/odoo,lgscofield/odoo,kybriainfotech/iSocioCRM,Daniel-CA/odoo,slevenhagen/odoo,vnsofthe/odoo,dariemp/odoo,n0m4dz/odoo,rubencabrera/odoo,MarcosCommunity/odoo,funkring/fdoo,OpenUpgrade/OpenUpgrade,jiangzhixiao/odoo,n0m4dz/odoo,goliveirab/odoo,alqfahad/odoo,patmcb/odoo,cloud9UG/odoo,datenbetrieb/odoo,slevenhagen/odoo,omprakasha/odoo,n0m4dz/odoo,datenbetrieb/odoo,stephen144/odoo,luistorresm/odoo,synconics/odoo,kybriainfotech/iSocioCRM,incaser/odoo-odoo,ovnicraft/odoo,BT-ojossen/odoo,ingadhoc/odoo,avoinsystems/odoo,Bachaco-ve/odoo,rahuldhote/odoo,rubencabrera/odoo,alqfahad/odoo,synconics/odoo,draugiskisprendimai/odoo,dfang/odoo,VielSoft/odoo,Noviat/odoo,Adel-Magebinary/odoo,BT-ojossen/odoo,shaufi10/odoo,Maspear/odoo,salaria/odoo,slevenhagen/odoo,datenbetrieb/odoo,rgeleta/odoo,luistorresm/odoo,luistorresm/odoo,optima-ict/odoo,microcom/odoo,cloud9UG/odoo,synconics/odoo,vnsofthe/odoo,lgscofield/odoo,alexcuellar/odoo,Adel-Magebinary/odoo,srimai/odoo,markeTIC/OCB,VielSoft/odoo,BT-ojossen/odoo,luiseduardohdbackup/odoo,Noviat/odoo,shingonoide/odoo,fevxie/odoo,laslabs/odoo,dfang/odoo,markeTIC/OCB,BT-fgarbely/odoo,dalegregory/odoo,poljeff/odoo,apocalypsebg/odoo,fuhongliang/odoo,odootr/odoo,apanju/GMIO_Odoo,lgscofield/odoo,cedk/odoo,sv-dev1/odoo,ingadhoc/odoo,dsfsdgsbngfggb/odoo,avoinsystems/odoo,RafaelTorrealba/odoo,markeTIC/OCB,optima-ict/odoo,makinacorpus/odoo,mustafat/odoo-1,datenbetrieb/odoo,hip-odoo/odoo,VielSoft/odoo,OpenUpgrade/OpenUpgrade,rowemoore/odoo,mlaitinen/odoo,factorlibre/OCB,nuncjo/odoo,GauravSahu/odoo,wangjun/odoo,Endika/odoo,bplancher/odoo,shaufi10/odoo,lsinfo/odoo,sysadminmatmoz/OCB,syci/OCB,chiragjogi/odoo,shaufi10/odoo,ShineFan/odoo,x111ong/odoo,hassoon3/odoo,srimai/odoo,ecosoft-odoo/odoo,lsinfo/odoo,stephen144/odoo,tvibliani/odoo,storm-computers/odoo,hip-odoo/odoo,ygol/odoo,nuncjo/odoo,bplancher/odoo,syci/OCB,Nowheresly/odoo,synconics/odoo,eino-makitalo/odoo,hassoon3/odoo,VielSoft/odoo,ecosoft-odoo/odoo,diagramsoftware/odoo,MarcosCommunity/odoo,dariemp/odoo,JGarcia-Panach/odoo,BT-rmartin/odoo,Endika/OpenUpgrade,cedk/odoo,fevxie/odoo,apanju/GMIO_Odoo,RafaelTorrealba/odoo,Daniel-CA/odoo,steedos/odoo,sergio-incaser/odoo,Endika/odoo,laslabs/odoo,rahuldhote/odoo,diagramsoftware/odoo,luiseduardohdbackup/odoo,brijeshkesariya/odoo,mustafat/odoo-1,BT-rmartin/odoo,odootr/odoo,Bachaco-ve/odoo,RafaelTorrealba/odoo,fevxie/odoo,hoatle/odoo,kittiu/odoo,shaufi10/odoo,hubsaysnuaa/odoo,leorochael/odoo,kittiu/odoo,ChanduERP/odoo,Elico-Corp/odoo_OCB,spadae22/odoo,ApuliaSoftware/odoo,hassoon3/odoo,KontorConsulting/odoo,mlaitinen/odoo,eino-makitalo/odoo,VielSoft/odoo,ovnicraft/odoo,QianBIG/odoo,srimai/odoo,JGarcia-Panach/odoo,factorlibre/OCB,srimai/odoo,alexcuellar/odoo,dariemp/odoo,windedge/odoo,chiragjogi/odoo,windedge/odoo,glovebx/odoo,shaufi10/odoo,Antiun/odoo,Nowheresly/odoo,tinkhaven-organization/odoo,sergio-incaser/odoo,goliveirab/odoo,lsinfo/odoo,rgeleta/odoo,apocalypsebg/odoo,vnsofthe/odoo,brijeshkesariya/odoo,laslabs/odoo,mszewczy/odoo,chiragjogi/odoo,chiragjogi/odoo,BT-rmartin/odoo,draugiskisprendimai/odoo,BT-fgarbely/odoo,goliveirab/odoo,brijeshkesariya/odoo,CatsAndDogsbvba/odoo,minhtuancn/odoo,xzYue/odoo,dsfsdgsbngfggb/odoo,spadae22/odoo,poljeff/odoo,Nowheresly/odoo,datenbetrieb/odoo,vnsofthe/odoo,Endika/odoo,hip-odoo/odoo,takis/odoo,tinkhaven-organization/odoo,tangyiyong/odoo,rahuldhote/odoo,bplancher/odoo,hanicker/odoo,nuncjo/odoo,lsinfo/odoo,Daniel-CA/odoo,Nowheresly/odoo,NeovaHealth/odoo,ecosoft-odoo/odoo,mustafat/odoo-1,jfpla/odoo,KontorConsulting/odoo,apocalypsebg/odoo,rubencabrera/odoo,srimai/odoo,Noviat/odoo,jiangzhixiao/odoo,datenbetrieb/odoo,Adel-Magebinary/odoo,NeovaHealth/odoo,ovnicraft/odoo,fjbatresv/odoo,glovebx/odoo,avoinsystems/odoo,rowemoore/odoo,tvibliani/odoo,grap/OpenUpgrade,avoinsystems/odoo,makinacorpus/odoo,fjbatresv/odoo,steedos/odoo,sysadminmatmoz/OCB,ecosoft-odoo/odoo,rahuldhote/odoo,bplancher/odoo,jiangzhixiao/odoo,steedos/odoo,hanicker/odoo,tinkhaven-organization/odoo,provaleks/o8,microcom/odoo,grap/OpenUpgrade,AuyaJackie/odoo,dfang/odoo,avoinsystems/odoo,AuyaJackie/odoo,mszewczy/odoo,sv-dev1/odoo,QianBIG/odoo,storm-computers/odoo,ovnicraft/odoo,apanju/GMIO_Odoo,dariemp/odoo,hassoon3/odoo,luistorresm/odoo,fjbatresv/odoo,gorjuce/odoo,luiseduardohdbackup/odoo,Endika/OpenUpgrade,cloud9UG/odoo,GauravSahu/odoo,ehirt/odoo,mszewczy/odoo,wangjun/odoo,Daniel-CA/odoo,Endika/odoo,omprakasha/odoo,n0m4dz/odoo,mszewczy/odoo,datenbetrieb/odoo,OpenUpgrade/OpenUpgrade,Bachaco-ve/odoo,Noviat/odoo,BT-fgarbely/odoo,jiangzhixiao/odoo,tvibliani/odoo,OpenUpgrade/OpenUpgrade,CatsAndDogsbvba/odoo,dsfsdgsbngfggb/odoo,slevenhagen/odoo,ChanduERP/odoo,sinbazhou/odoo,hanicker/odoo,jfpla/odoo,microcom/odoo,tinkhaven-organization/odoo,spadae22/odoo,fevxie/odoo,AuyaJackie/odoo,ecosoft-odoo/odoo,makinacorpus/odoo,minhtuancn/odoo,syci/OCB,diagramsoftware/odoo,goliveirab/odoo,diagramsoftware/odoo,Elico-Corp/odoo_OCB,KontorConsulting/odoo,alexcuellar/odoo,ApuliaSoftware/odoo,steedos/odoo,RafaelTorrealba/odoo,shaufi10/odoo,QianBIG/odoo,cedk/odoo,rubencabrera/odoo,kittiu/odoo,goliveirab/odoo,shingonoide/odoo,Endika/OpenUpgrade,shingonoide/odoo,BT-fgarbely/odoo,srimai/odoo,JGarcia-Panach/odoo,CatsAndDogsbvba/odoo,Elico-Corp/odoo_OCB,leorochael/odoo,sv-dev1/odoo,alexcuellar/odoo,wangjun/odoo,Endika/OpenUpgrade,draugiskisprendimai/odoo,wangjun/odoo,rahuldhote/odoo,minhtuancn/odoo,provaleks/o8,BT-fgarbely/odoo,sv-dev1/odoo,NeovaHealth/odoo,ecosoft-odoo/odoo,MarcosCommunity/odoo,ygol/odoo,Maspear/odoo,jfpla/odoo,ygol/odoo,ChanduERP/odoo,hassoon3/odoo,ShineFan/odoo,tinkhaven-organization/odoo,CatsAndDogsbvba/odoo,Adel-Magebinary/odoo,nuncjo/odoo,Adel-Magebinary/odoo,factorlibre/OCB,acshan/odoo,shingonoide/odoo,apanju/GMIO_Odoo,ehirt/odoo,omprakasha/odoo,wangjun/odoo,Antiun/odoo,optima-ict/odoo,eino-makitalo/odoo,xzYue/odoo,draugiskisprendimai/odoo,hoatle/odoo,steedos/odoo,steedos/odoo,gorjuce/odoo,ovnicraft/odoo,factorlibre/OCB,Nowheresly/odoo,incaser/odoo-odoo,shaufi/odoo,cloud9UG/odoo,dfang/odoo,sergio-incaser/odoo,alqfahad/odoo,GauravSahu/odoo,hanicker/odoo,brijeshkesariya/odoo,shaufi/odoo,GauravSahu/odoo,sv-dev1/odoo,spadae22/odoo,fuhongliang/odoo,acshan/odoo,sinbazhou/odoo,synconics/odoo,Bachaco-ve/odoo,grap/OpenUpgrade,Antiun/odoo,vnsofthe/odoo,KontorConsulting/odoo,grap/OpenUpgrade,windedge/odoo,diagramsoftware/odoo,OpenUpgrade/OpenUpgrade,kittiu/odoo,BT-rmartin/odoo,eino-makitalo/odoo,makinacorpus/odoo,sysadminmatmoz/OCB,syci/OCB,tangyiyong/odoo,storm-computers/odoo,VielSoft/odoo,syci/OCB,BT-rmartin/odoo,hubsaysnuaa/odoo,makinacorpus/odoo,diagramsoftware/odoo,fuhongliang/odoo,Endika/OpenUpgrade,kybriainfotech/iSocioCRM,incaser/odoo-odoo,tangyiyong/odoo,mlaitinen/odoo,ingadhoc/odoo,dsfsdgsbngfggb/odoo,slevenhagen/odoo,dfang/odoo,dalegregory/odoo,cedk/odoo,jiangzhixiao/odoo,grap/OpenUpgrade,windedge/odoo,shaufi/odoo,fevxie/odoo,hubsaysnuaa/odoo,lsinfo/odoo,poljeff/odoo,takis/odoo,ecosoft-odoo/odoo,markeTIC/OCB,funkring/fdoo,MarcosCommunity/odoo,luiseduardohdbackup/odoo,rgeleta/odoo,mszewczy/odoo,acshan/odoo,ShineFan/odoo,Daniel-CA/odoo,dalegregory/odoo,factorlibre/OCB,acshan/odoo,JGarcia-Panach/odoo,ApuliaSoftware/odoo,provaleks/o8,jfpla/odoo,ehirt/odoo,CatsAndDogsbvba/odoo,glovebx/odoo,sysadminmatmoz/OCB,fjbatresv/odoo,salaria/odoo,RafaelTorrealba/odoo,nuncjo/odoo,luiseduardohdbackup/odoo,RafaelTorrealba/odoo,NeovaHealth/odoo,JGarcia-Panach/odoo,salaria/odoo,funkring/fdoo,rowemoore/odoo,storm-computers/odoo,sinbazhou/odoo,patmcb/odoo,rgeleta/odoo,n0m4dz/odoo,kittiu/odoo,markeTIC/OCB,cedk/odoo,grap/OpenUpgrade,hassoon3/odoo,omprakasha/odoo,optima-ict/odoo,takis/odoo,rahuldhote/odoo,kybriainfotech/iSocioCRM,rowemoore/odoo,KontorConsulting/odoo,tvibliani/odoo,gorjuce/odoo,GauravSahu/odoo,glovebx/odoo,AuyaJackie/odoo,dariemp/odoo,kittiu/odoo,ygol/odoo,draugiskisprendimai/odoo,glovebx/odoo,rgeleta/odoo,factorlibre/OCB,slevenhagen/odoo,storm-computers/odoo,brijeshkesariya/odoo,x111ong/odoo,luistorresm/odoo,ingadhoc/odoo,sinbazhou/odoo,x111ong/odoo,synconics/odoo,fuhongliang/odoo,odootr/odoo,JGarcia-Panach/odoo,poljeff/odoo,Daniel-CA/odoo,ygol/odoo,apocalypsebg/odoo,lgscofield/odoo,funkring/fdoo,funkring/fdoo,jfpla/odoo,patmcb/odoo,odootr/odoo,ygol/odoo,makinacorpus/odoo,mustafat/odoo-1,Maspear/odoo,QianBIG/odoo,fjbatresv/odoo,BT-fgarbely/odoo,provaleks/o8,n0m4dz/odoo,patmcb/odoo,minhtuancn/odoo,stephen144/odoo,x111ong/odoo,sysadminmatmoz/OCB,hubsaysnuaa/odoo,hanicker/odoo,x111ong/odoo,hip-odoo/odoo,patmcb/odoo,incaser/odoo-odoo,mszewczy/odoo,ApuliaSoftware/odoo,acshan/odoo,sinbazhou/odoo,windedge/odoo,ehirt/odoo,xzYue/odoo,QianBIG/odoo,Elico-Corp/odoo_OCB,lsinfo/odoo,apanju/GMIO_Odoo,Maspear/odoo,storm-computers/odoo,rowemoore/odoo,leorochael/odoo,ShineFan/odoo,cloud9UG/odoo,lgscofield/odoo,stephen144/odoo,acshan/odoo,microcom/odoo,fjbatresv/odoo,spadae22/odoo,glovebx/odoo,kittiu/odoo,Noviat/odoo,sergio-incaser/odoo,CatsAndDogsbvba/odoo,rgeleta/odoo,CatsAndDogsbvba/odoo,cloud9UG/odoo,laslabs/odoo,windedge/odoo,KontorConsulting/odoo,dsfsdgsbngfggb/odoo,x111ong/odoo,steedos/odoo,rubencabrera/odoo,chiragjogi/odoo,spadae22/odoo,tvibliani/odoo,hubsaysnuaa/odoo,salaria/odoo,jfpla/odoo,glovebx/odoo,AuyaJackie/odoo,ehirt/odoo,BT-ojossen/odoo,jfpla/odoo,OpenUpgrade/OpenUpgrade,windedge/odoo,ChanduERP/odoo,srimai/odoo,Adel-Magebinary/odoo,Adel-Magebinary/odoo,Endika/OpenUpgrade,mustafat/odoo-1,hip-odoo/odoo,mszewczy/odoo,tinkhaven-organization/odoo,wangjun/odoo,Antiun/odoo,luistorresm/odoo,dariemp/odoo,rubencabrera/odoo,takis/odoo,vnsofthe/odoo,Antiun/odoo,rowemoore/odoo,slevenhagen/odoo,GauravSahu/odoo,mlaitinen/odoo,salaria/odoo,rahuldhote/odoo,Maspear/odoo,leorochael/odoo,mlaitinen/odoo,stephen144/odoo,sinbazhou/odoo,nuncjo/odoo,tvibliani/odoo,laslabs/odoo,syci/OCB,ingadhoc/odoo,dalegregory/odoo,shingonoide/odoo,spadae22/odoo,sv-dev1/odoo,apocalypsebg/odoo,Nowheresly/odoo,Maspear/odoo,Bachaco-ve/odoo,RafaelTorrealba/odoo,ingadhoc/odoo,funkring/fdoo,sysadminmatmoz/OCB,odootr/odoo,Endika/odoo,apanju/GMIO_Odoo,xzYue/odoo,rgeleta/odoo,Nowheresly/odoo,lsinfo/odoo,patmcb/odoo,BT-ojossen/odoo,hoatle/odoo,dsfsdgsbngfggb/odoo,gorjuce/odoo,NeovaHealth/odoo,dalegregory/odoo,n0m4dz/odoo,x111ong/odoo,lgscofield/odoo,laslabs/odoo,salaria/odoo,leorochael/odoo,fuhongliang/odoo,ehirt/odoo,leorochael/odoo,luistorresm/odoo,ChanduERP/odoo,fevxie/odoo,provaleks/o8,QianBIG/odoo,cloud9UG/odoo,ingadhoc/odoo,alexcuellar/odoo,cedk/odoo,shingonoide/odoo,tinkhaven-organization/odoo,xzYue/odoo,sergio-incaser/odoo,luiseduardohdbackup/odoo,alexcuellar/odoo,BT-ojossen/odoo,leorochael/odoo,ShineFan/odoo,JGarcia-Panach/odoo,eino-makitalo/odoo,brijeshkesariya/odoo,kybriainfotech/iSocioCRM,draugiskisprendimai/odoo,mustafat/odoo-1,Daniel-CA/odoo,tvibliani/odoo,goliveirab/odoo,sv-dev1/odoo,ApuliaSoftware/odoo,sinbazhou/odoo,patmcb/odoo,poljeff/odoo,shaufi/odoo,avoinsystems/odoo,stephen144/odoo,shaufi/odoo,factorlibre/OCB,cedk/odoo,sysadminmatmoz/OCB,hoatle/odoo,jiangzhixiao/odoo,eino-makitalo/odoo,Endika/OpenUpgrade,incaser/odoo-odoo,hanicker/odoo,ChanduERP/odoo,tangyiyong/odoo,omprakasha/odoo,grap/OpenUpgrade,hip-odoo/odoo,minhtuancn/odoo,ApuliaSoftware/odoo,optima-ict/odoo,apanju/GMIO_Odoo,diagramsoftware/odoo,makinacorpus/odoo,alqfahad/odoo,Noviat/odoo,omprakasha/odoo,sergio-incaser/odoo,wangjun/odoo,brijeshkesariya/odoo,vnsofthe/odoo,microcom/odoo,minhtuancn/odoo,MarcosCommunity/odoo,bplancher/odoo,kybriainfotech/iSocioCRM,ygol/odoo,gorjuce/odoo,shaufi10/odoo,draugiskisprendimai/odoo,Noviat/odoo,mustafat/odoo-1,hubsaysnuaa/odoo,tangyiyong/odoo,MarcosCommunity/odoo,ShineFan/odoo,NeovaHealth/odoo,funkring/fdoo,omprakasha/odoo,xzYue/odoo,eino-makitalo/odoo,odootr/odoo,gorjuce/odoo,shaufi/odoo,KontorConsulting/odoo,hoatle/odoo,goliveirab/odoo,ChanduERP/odoo,kybriainfotech/iSocioCRM,alexcuellar/odoo,GauravSahu/odoo,xzYue/odoo,ovnicraft/odoo,Bachaco-ve/odoo,Elico-Corp/odoo_OCB,ShineFan/odoo,chiragjogi/odoo,gorjuce/odoo,poljeff/odoo,chiragjogi/odoo,synconics/odoo,hubsaysnuaa/odoo,AuyaJackie/odoo,nuncjo/odoo,Antiun/odoo,fevxie/odoo