[FIX] auth_oauth: don't assume that google and facebook providers always exist
[FIX] auth_oauth: don't assume that google and facebook providers always exist

Before this commit, it was not possible to reach the general settings when one
of the "default" provider was delete.
After this commit, we don't assume anymore that there are google and facebook
providers.

opw-746907

CatsAndDogsbvba/odoo,synconics/odoo,diagramsoftware/odoo,vnsofthe/odoo,ygol/odoo,spadae22/odoo,hip-odoo/odoo,Nowheresly/odoo,Elico-Corp/odoo_OCB,datenbetrieb/odoo,ygol/odoo,tvibliani/odoo,alexcuellar/odoo,diagramsoftware/odoo,tvibliani/odoo,hip-odoo/odoo,OpenUpgrade/OpenUpgrade,odootr/odoo,glovebx/odoo,synconics/odoo,leorochael/odoo,odootr/odoo,alexcuellar/odoo,synconics/odoo,alexcuellar/odoo,funkring/fdoo,ygol/odoo,Elico-Corp/odoo_OCB,synconics/odoo,leorochael/odoo,CatsAndDogsbvba/odoo,spadae22/odoo,odootr/odoo,Nowheresly/odoo,diagramsoftware/odoo,leorochael/odoo,NeovaHealth/odoo,tvibliani/odoo,vnsofthe/odoo,synconics/odoo,synconics/odoo,glovebx/odoo,funkring/fdoo,hip-odoo/odoo,NeovaHealth/odoo,spadae22/odoo,tvibliani/odoo,NeovaHealth/odoo,CatsAndDogsbvba/odoo,vnsofthe/odoo,diagramsoftware/odoo,NeovaHealth/odoo,funkring/fdoo,funkring/fdoo,CatsAndDogsbvba/odoo,OpenUpgrade/OpenUpgrade,ygol/odoo,vnsofthe/odoo,makinacorpus/odoo,OpenUpgrade/OpenUpgrade,Elico-Corp/odoo_OCB,CatsAndDogsbvba/odoo,odootr/odoo,ygol/odoo,OpenUpgrade/OpenUpgrade,datenbetrieb/odoo,Nowheresly/odoo,NeovaHealth/odoo,synconics/odoo,leorochael/odoo,Nowheresly/odoo,funkring/fdoo,datenbetrieb/odoo,glovebx/odoo,OpenUpgrade/OpenUpgrade,funkring/fdoo,vnsofthe/odoo,Nowheresly/odoo,spadae22/odoo,makinacorpus/odoo,leorochael/odoo,CatsAndDogsbvba/odoo,glovebx/odoo,Elico-Corp/odoo_OCB,funkring/fdoo,diagramsoftware/odoo,datenbetrieb/odoo,vnsofthe/odoo,makinacorpus/odoo,Elico-Corp/odoo_OCB,datenbetrieb/odoo,alexcuellar/odoo,odootr/odoo,datenbetrieb/odoo,datenbetrieb/odoo,hip-odoo/odoo,odootr/odoo,hip-odoo/odoo,alexcuellar/odoo,ygol/odoo,alexcuellar/odoo,CatsAndDogsbvba/odoo,ygol/odoo,spadae22/odoo,OpenUpgrade/OpenUpgrade,leorochael/odoo,OpenUpgrade/OpenUpgrade,glovebx/odoo,spadae22/odoo,makinacorpus/odoo,alexcuellar/odoo,glovebx/odoo,tvibliani/odoo,odootr/odoo,diagramsoftware/odoo,Nowheresly/odoo,Elico-Corp/odoo_OCB,tvibliani/odoo,makinacorpus/odoo,glovebx/odoo,diagramsoftware/odoo,hip-odoo/odoo,NeovaHealth/odoo,vnsofthe/odoo,Nowheresly/odoo,tvibliani/odoo,NeovaHealth/odoo,makinacorpus/odoo,makinacorpus/odoo,spadae22/odoo,leorochael/odoo