Fix exception raising in CDS parser
Fix exception raising in CDS parser

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