Make sure mixin cols have mask if needed after inserting rows
Make sure mixin cols have mask if needed after inserting rows

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