Add test for sigma_clip scalar mask
Add test for sigma_clip scalar mask

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