[FIX] models: in method read_group(), allow orderby='id desc'
[FIX] models: in method read_group(), allow orderby='id desc'

When orderby argument is 'id desc', an error occurs: "read_group order by 'id'
ignored, cannot sort on empty..."

OpenUpgrade/OpenUpgrade,leorochael/odoo,vnsofthe/odoo,hip-odoo/odoo,bplancher/odoo,Noviat/odoo,datenbetrieb/odoo,funkring/fdoo,vnsofthe/odoo,datenbetrieb/odoo,NeovaHealth/odoo,leorochael/odoo,funkring/fdoo,OpenUpgrade/OpenUpgrade,Adel-Magebinary/odoo,glovebx/odoo,Nowheresly/odoo,ehirt/odoo,Daniel-CA/odoo,odootr/odoo,laslabs/odoo,NeovaHealth/odoo,ygol/odoo,Daniel-CA/odoo,leorochael/odoo,laslabs/odoo,mustafat/odoo-1,Elico-Corp/odoo_OCB,diagramsoftware/odoo,ygol/odoo,ehirt/odoo,Nowheresly/odoo,Adel-Magebinary/odoo,diagramsoftware/odoo,Adel-Magebinary/odoo,laslabs/odoo,tvibliani/odoo,ehirt/odoo,dfang/odoo,Noviat/odoo,Elico-Corp/odoo_OCB,Nowheresly/odoo,vnsofthe/odoo,Daniel-CA/odoo,mustafat/odoo-1,ygol/odoo,Noviat/odoo,synconics/odoo,OpenUpgrade/OpenUpgrade,Nowheresly/odoo,hip-odoo/odoo,dfang/odoo,datenbetrieb/odoo,laslabs/odoo,NeovaHealth/odoo,Noviat/odoo,dfang/odoo,funkring/fdoo,spadae22/odoo,diagramsoftware/odoo,datenbetrieb/odoo,bplancher/odoo,storm-computers/odoo,ehirt/odoo,CatsAndDogsbvba/odoo,NeovaHealth/odoo,odootr/odoo,OpenUpgrade/OpenUpgrade,bplancher/odoo,Nowheresly/odoo,mustafat/odoo-1,synconics/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,tvibliani/odoo,synconics/odoo,hip-odoo/odoo,Daniel-CA/odoo,Daniel-CA/odoo,leorochael/odoo,datenbetrieb/odoo,CatsAndDogsbvba/odoo,OpenUpgrade/OpenUpgrade,OpenUpgrade/OpenUpgrade,bplancher/odoo,odootr/odoo,makinacorpus/odoo,synconics/odoo,BT-ojossen/odoo,OpenUpgrade/OpenUpgrade,Elico-Corp/odoo_OCB,hip-odoo/odoo,odootr/odoo,dfang/odoo,tvibliani/odoo,datenbetrieb/odoo,Adel-Magebinary/odoo,funkring/fdoo,alexcuellar/odoo,microcom/odoo,storm-computers/odoo,alexcuellar/odoo,CatsAndDogsbvba/odoo,CatsAndDogsbvba/odoo,vnsofthe/odoo,ygol/odoo,makinacorpus/odoo,mustafat/odoo-1,Elico-Corp/odoo_OCB,odootr/odoo,dfang/odoo,BT-ojossen/odoo,alexcuellar/odoo,ygol/odoo,funkring/fdoo,spadae22/odoo,funkring/fdoo,synconics/odoo,BT-ojossen/odoo,spadae22/odoo,dfang/odoo,CatsAndDogsbvba/odoo,NeovaHealth/odoo,microcom/odoo,Noviat/odoo,makinacorpus/odoo,Adel-Magebinary/odoo,spadae22/odoo,glovebx/odoo,diagramsoftware/odoo,ehirt/odoo,glovebx/odoo,spadae22/odoo,synconics/odoo,glovebx/odoo,odootr/odoo,Noviat/odoo,BT-ojossen/odoo,makinacorpus/odoo,laslabs/odoo,datenbetrieb/odoo,Adel-Magebinary/odoo,BT-ojossen/odoo,laslabs/odoo,NeovaHealth/odoo,storm-computers/odoo,glovebx/odoo,makinacorpus/odoo,microcom/odoo,BT-ojossen/odoo,ehirt/odoo,glovebx/odoo,vnsofthe/odoo,hip-odoo/odoo,odootr/odoo,tvibliani/odoo,alexcuellar/odoo,storm-computers/odoo,Nowheresly/odoo,diagramsoftware/odoo,Daniel-CA/odoo,ehirt/odoo,alexcuellar/odoo,makinacorpus/odoo,tvibliani/odoo,mustafat/odoo-1,diagramsoftware/odoo,microcom/odoo,vnsofthe/odoo,bplancher/odoo,mustafat/odoo-1,diagramsoftware/odoo,alexcuellar/odoo,vnsofthe/odoo,NeovaHealth/odoo,Adel-Magebinary/odoo,funkring/fdoo,leorochael/odoo,leorochael/odoo,mustafat/odoo-1,leorochael/odoo,microcom/odoo,CatsAndDogsbvba/odoo,tvibliani/odoo,hip-odoo/odoo,Daniel-CA/odoo,Noviat/odoo,spadae22/odoo,storm-computers/odoo,glovebx/odoo,ygol/odoo,spadae22/odoo,ygol/odoo,CatsAndDogsbvba/odoo,microcom/odoo,tvibliani/odoo,makinacorpus/odoo,alexcuellar/odoo,bplancher/odoo,BT-ojossen/odoo,Elico-Corp/odoo_OCB,Nowheresly/odoo,synconics/odoo