`cimimport` cannot report failures to calling function

Even on malformed input, cimimport runs to the end and does not report an error to the calling function. All errors are just printed to the terminal.

I think cimpy should throw an exception upon receiving malformed input.

Example output (importing only one of the example files):

Referenced TopologicalNode [_16f5db35-83c6-418e-ae9e-69f05e77147b] object missing. : 1 times
Referenced TopologicalNode [_371cfe37-f187-4fb8-8402-d7f7f5a0dfda] object missing. : 1 times
Referenced TopologicalNode [_6bd6b703-519b-46a8-a1f8-632f7e9d05f1] object missing. : 1 times
Missing Terminal object with uuid: E-301 : 1 times
Missing Terminal object with uuid: E-302 : 1 times
Missing Terminal object with uuid: E-309 : 1 times