Fix io.registry tests
Fix io.registry tests

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