fix error while loading if no window is focused
fix error while loading if no window is focused

simonzack/SublimeLinter3,lunixbochs/sublimelint,smanolloff/SublimeLinter3,ikappas/SublimeLinter3,zenlambda/SublimeLinter3,paulirish/SublimeLinter3,jasonrhaas/SublimeLinter3,simonzack/SublimeLinter3,Raynos/SublimeLinter3-raynos,zenlambda/SublimeLinter3,paulirish/SublimeLinter3,jasonrhaas/SublimeLinter3,ikappas/SublimeLinter3,lunixbochs/sublimelint,SublimeLinter/SublimeLinter3,SublimeLinter/SublimeLinter3,smanolloff/SublimeLinter3