Fix assumption that uncertainty has a unit
Fix assumption that uncertainty has a unit

astropy/astropy,dhomeier/astropy,larrybradley/astropy,astropy/astropy,dhomeier/astropy,stargaser/astropy,lpsinger/astropy,saimn/astropy,larrybradley/astropy,StuartLittlefair/astropy,stargaser/astropy,mhvk/astropy,pllim/astropy,mhvk/astropy,pllim/astropy,astropy/astropy,MSeifert04/astropy,larrybradley/astropy,MSeifert04/astropy,mhvk/astropy,saimn/astropy,pllim/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,astropy/astropy,bsipocz/astropy,astropy/astropy,lpsinger/astropy,larrybradley/astropy,lpsinger/astropy,dhomeier/astropy,larrybradley/astropy,pllim/astropy,stargaser/astropy,dhomeier/astropy,MSeifert04/astropy,saimn/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,pllim/astropy,MSeifert04/astropy,saimn/astropy,dhomeier/astropy,bsipocz/astropy,stargaser/astropy,bsipocz/astropy,mhvk/astropy,saimn/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,mhvk/astropy,StuartLittlefair/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,lpsinger/astropy