Add clear_layout to lm instead of calling container.clear_widgets() from rv. Consistenly accept none from get_viewclass. Fix binding and other issues.
Add clear_layout to lm instead of calling container.clear_widgets() from rv. Consistenly accept none from get_viewclass. Fix binding and other issues.

manthansharma/kivy,Cheaterman/kivy,bionoid/kivy,rafalo1333/kivy,rnixx/kivy,akshayaurora/kivy,jkankiewicz/kivy,andnovar/kivy,kived/kivy,inclement/kivy,jegger/kivy,janssen/kivy,kivy/kivy,KeyWeeUsr/kivy,el-ethan/kivy,kived/kivy,jegger/kivy,jegger/kivy,KeyWeeUsr/kivy,el-ethan/kivy,rnixx/kivy,autosportlabs/kivy,jkankiewicz/kivy,bionoid/kivy,el-ethan/kivy,LogicalDash/kivy,akshayaurora/kivy,LogicalDash/kivy,matham/kivy,KeyWeeUsr/kivy,tony/kivy,jegger/kivy,bionoid/kivy,darkopevec/kivy,aron-bordin/kivy,matham/kivy,manthansharma/kivy,kivy/kivy,manthansharma/kivy,darkopevec/kivy,rafalo1333/kivy,jkankiewicz/kivy,autosportlabs/kivy,aron-bordin/kivy,jkankiewicz/kivy,matham/kivy,janssen/kivy,KeyWeeUsr/kivy,darkopevec/kivy,kivy/kivy,kived/kivy,aron-bordin/kivy,rnixx/kivy,darkopevec/kivy,LogicalDash/kivy,tony/kivy,tony/kivy,Cheaterman/kivy,janssen/kivy,Cheaterman/kivy,andnovar/kivy,aron-bordin/kivy,LogicalDash/kivy,rafalo1333/kivy,matham/kivy,akshayaurora/kivy,andnovar/kivy,Cheaterman/kivy,janssen/kivy,inclement/kivy,bionoid/kivy,manthansharma/kivy,autosportlabs/kivy,inclement/kivy