Remove duplicate OSError
Remove duplicate OSError

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