More reliable test for (unit, None) converter
More reliable test for (unit, None) converter

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