fix missing scipy error
fix missing scipy error

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