Fix for not releasing lock correctly in clear_download_cache
Fix for not releasing lock correctly in clear_download_cache

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