Don't emit "still-ok" when there are errors
Don't emit "still-ok" when there are errors

Emitting "still-ok" and returning means that no "error" event is
emitted , forcing the user to manually refresh the page to see compile
errors.

This change causes compile errors to be shown with no manual refresh
needed.

bdwain/webpack-dev-server,webpack/webpack-dev-server,bdwain/webpack-dev-server,webpack/webpack-dev-server