Fixed variable recognition when it is a concept

src/core/sheerka/services/SheerkaCreateNewConcept.py

@@ -21,6 +21,7 @@ class SheerkaCreateNewConcept(BaseService):
 
     def initialize(self):
         self.sheerka.bind_service_method(self.create_new_concept, True)
+        self.sheerka.bind_service_method(self.not_is_variable, False, visible=False)
 
     def create_new_concept(self, context, concept: Concept):
         """
@@ -108,3 +109,11 @@ class SheerkaCreateNewConcept(BaseService):
                 refs.add(concept.id)
 
         return refs
+
+    def not_is_variable(self, name):
+        """
+        Given a name tells if it refers to a variable name
+        :param name:
+        :return:
+        """
+        return not self.sheerka.cache_manager.get(self.sheerka.CONCEPTS_BY_NAME_ENTRY, name)