Fix crash: some of this vars can be None.
Fix crash: some of this vars can be None.

manthansharma/kivy,rnixx/kivy,rafalo1333/kivy,akshayaurora/kivy,rnixx/kivy,manthansharma/kivy,autosportlabs/kivy,LogicalDash/kivy,Cheaterman/kivy,jegger/kivy,autosportlabs/kivy,matham/kivy,KeyWeeUsr/kivy,inclement/kivy,jkankiewicz/kivy,KeyWeeUsr/kivy,bionoid/kivy,rafalo1333/kivy,jkankiewicz/kivy,kivy/kivy,jegger/kivy,bionoid/kivy,matham/kivy,kivy/kivy,Cheaterman/kivy,kivy/kivy,bionoid/kivy,kived/kivy,KeyWeeUsr/kivy,janssen/kivy,tony/kivy,LogicalDash/kivy,matham/kivy,manthansharma/kivy,jegger/kivy,jkankiewicz/kivy,jegger/kivy,tony/kivy,jkankiewicz/kivy,manthansharma/kivy,LogicalDash/kivy,tony/kivy,matham/kivy,Cheaterman/kivy,bionoid/kivy,LogicalDash/kivy,kived/kivy,inclement/kivy,KeyWeeUsr/kivy,akshayaurora/kivy,akshayaurora/kivy,kived/kivy,janssen/kivy,rnixx/kivy,janssen/kivy,janssen/kivy,rafalo1333/kivy,inclement/kivy,Cheaterman/kivy,autosportlabs/kivy