fix exception assertion test
fix exception assertion test

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