qmltocpp asserts too late when it cannot find the component in ComponentRegistry

Build process crashes without any clear error when qmltocpp asserts in a late stage because it cannot find the component in ComponentRegistry which should be addressed by returning early with a clear error message when the component isn't valid during registering Components.

Way to reproduce:
1) Try to build the attached example project with Qt for MCUs 2.6
2) Check the build log where you can see that qmltocpp asserted without any clear error message