Change raised error to AttributeError if version number cannot be determined
Change raised error to AttributeError if version number cannot be determined

saimn/astropy,MSeifert04/astropy,saimn/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,astropy/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,kelle/astropy,bsipocz/astropy,lpsinger/astropy,DougBurke/astropy,AustereCuriosity/astropy,stargaser/astropy,MSeifert04/astropy,joergdietrich/astropy,mhvk/astropy,tbabej/astropy,joergdietrich/astropy,saimn/astropy,pllim/astropy,funbaker/astropy,mhvk/astropy,dhomeier/astropy,kelle/astropy,pllim/astropy,stargaser/astropy,DougBurke/astropy,funbaker/astropy,tbabej/astropy,lpsinger/astropy,stargaser/astropy,mhvk/astropy,DougBurke/astropy,DougBurke/astropy,StuartLittlefair/astropy,astropy/astropy,larrybradley/astropy,kelle/astropy,saimn/astropy,pllim/astropy,larrybradley/astropy,joergdietrich/astropy,dhomeier/astropy,bsipocz/astropy,pllim/astropy,dhomeier/astropy,tbabej/astropy,AustereCuriosity/astropy,tbabej/astropy,astropy/astropy,dhomeier/astropy,tbabej/astropy,larrybradley/astropy,saimn/astropy,AustereCuriosity/astropy,MSeifert04/astropy,StuartLittlefair/astropy,kelle/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,funbaker/astropy,kelle/astropy,joergdietrich/astropy,lpsinger/astropy,mhvk/astropy,MSeifert04/astropy,astropy/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,astropy/astropy,funbaker/astropy,lpsinger/astropy,larrybradley/astropy,stargaser/astropy,dhomeier/astropy,joergdietrich/astropy,pllim/astropy,larrybradley/astropy,mhvk/astropy