Fix bug with __slots__ : if a class with __slots__ inherits a class without __slots__, ignore all __slots__
Fix bug with __slots__ : if a class with __slots__ inherits a class without __slots__, ignore all __slots__

jonathanverner/brython,brython-dev/brython,jonathanverner/brython,Hasimir/brython,jonathanverner/brython,Hasimir/brython,Hasimir/brython,brython-dev/brython,kikocorreoso/brython,jonathanverner/brython,brython-dev/brython,Hasimir/brython,kikocorreoso/brython,kikocorreoso/brython