fix blank lines causing pep8 error
fix blank lines causing pep8 error

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