F better parser error

Summary

Just a bit better error message: Now says in which line a yaml error happens.

Focus

Test Environment

make unittest or run the code in test_yaml_model_parser.py manually. Look at the error message in the ValueError.

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• Appropriate user and developer documentation (or not necessary)
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manual_tests/test_labfolder_import.py

@@ -32,7 +32,7 @@ from caosadvancedtools.converter import labfolder_export as labfolder
 
 def main(args):
     """The main function."""
-    model = parse_model_from_yaml("./model.yml")
+    model = parse_model_from_yaml("./models/model.yml")
 
     model.sync_data_model()
     labfolder.import_data(args.folder)