??? fix mypy

Author: syntron

OMPython/ModelicaSystem.py

@@ -1914,6 +1914,8 @@ def __init__(
         ModelicaSystem.simulate(). Additionally, the path to store the result files is needed (= resultpath) as well as
         a list of parameters to vary for the Doe (= parameters). All possible combinations are considered.
         """
+        if modelName is None:
+            raise ModelicaSystemError("No model name provided!")
 
         self._mod = ModelicaSystem(
             commandLineOptions=commandLineOptions,