[Interest] Suggestion: Change default QML main.cpp

[Jason H]

After the
	engine.load(QUrl(QLatin1String("qrc:/main.qml")));

call, if there is a parsing error, the engine is empty. The eventloop will continue to run. Therefore, it should check before starting the event loop.

	if (engine.rootObjects().size() > 0)
		return app.exec();

	return 255;

This will help both in Creator from having many processes running that are filling up the App output tab, as well as any scripts that expect a process to be usable, but have failed to load.