QML FileSelector: Existing base file needed, even if only a variant is used

When using a custom Qml component Sample which is implemented in an additional variant, the base implementation needs to exist, even if only a variant is used.

If the base implementation does not exist, the QQmlApplicationEngine complains to load the custom component.

Output of the attached sample:

QQmlApplicationEngine failed to load component
qrc:/main.qml:7 Sample is not a type