allow sphinx build to proceed even without gallery
allow sphinx build to proceed even without gallery

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