Fixed logic if there is no PID file... start Xvfb
Fixed logic if there is no PID file... start Xvfb

tomzhang/showslow,sergeychernyshev/showslow,tomzhang/showslow,sergeychernyshev/showslow,sergeychernyshev/showslow,tomzhang/showslow,sergeychernyshev/showslow,tomzhang/showslow,sergeychernyshev/showslow,tomzhang/showslow