Improve code flow in _convert_data_to_col
Improve code flow in _convert_data_to_col

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