Bad error messages when misconfiguring QtGP through gradle.properties

Steps to reproduce:

1. Remove QtBuild block from build.gradle(.kts)
2. Set qt.kitDir or qt.path or qt.projectPath to nonexisting location in gradle.properties

If setting qt.path to nonexisting location:

* What went wrong:
Execution failed for task ':app:QtBuildTask'.
> No Qt for Android kit found from:

If setting qt.kitDir to nonexisting location the value is just ignored silently.

If setting qt.projectPath to nonexisting location:

* What went wrong:
A problem occurred configuring project ':app'.
> Could not create task ':app:QtBuildTask'.
   > Cannot cast object '' with class 'java.lang.String' to class 'java.io.File'