Better reporting of errors caused by missing Python DLLs
Currently, the only message to the SCL console from a missing Python DLL is in the form of Java class import exceptions from the SCL compiler.
> import "Python"
Failed to import Python, because it contains compilation errors.
Didn't find class org.simantics.pythonlink.NDArray.
Didn't find class org.simantics.pythonlink.PythonContext.
Didn't find class org.simantics.pythonlink.Python.