Fixed some bugs

src/evaluators/PythonEvaluator.py

@@ -298,6 +298,12 @@ class PythonEvaluator(OneReturnValueEvaluator):
 
     @staticmethod
     def resolve_concept(context, concept_hint):
+        """
+        Try to find a concept by its name, id or the pattern c:key|id:
+        :param context:
+        :param concept_hint:
+        :return:
+        """
         if isinstance(concept_hint, Concept):
             return concept_hint
 
@@ -310,6 +316,10 @@ class PythonEvaluator(OneReturnValueEvaluator):
             # So a concept was explicitly required, not its value
             # We mark the concept as already evaluated, so it's body will not be evaluated
             new_instance.metadata.is_evaluated = True
+        if len(concept.metadata.variables) > 0:
+            # In this situation, it means that we are dealing with the concept and not its instantiation
+            # So do not try to evaluate it
+            new_instance.metadata.is_evaluated = True
 
         return new_instance