Fix test runner: allow single doc paths to be tested again
Fix test runner: allow single doc paths to be tested again

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