Bug fixing in postprocess

Numpy array in if-statement lead to error. Bug fixed by checking if object is None.

src/modules/applications/optimization/Optimization.py

@@ -123,7 +123,7 @@ def postprocess(self, input_data: any, config: dict, **kwargs) -> (any, float):
             solution_validity = False
             time_to_process_solution = None
             time_to_validation = None
-        if solution_validity and processed_solution:
+        if solution_validity and (processed_solution is not None):
             solution_quality, time_to_evaluation = self.evaluate(processed_solution)
         else:
             solution_quality = None