FIX: "required" list for references fixed.

src/caosadvancedtools/json_schema_exporter.py

@@ -137,8 +137,6 @@ class JsonSchemaExporter:
             if rt.get_importance(prop.name) != db.OBLIGATORY:
                 continue
             prop_name = prop.name
-            if isinstance(prop.datatype, db.Entity):
-                prop_name = prop.datatype.name
             required_list.append(prop_name)
 
         return required_list

unittests/test_json_schema_exporter.py

@@ -613,7 +613,7 @@ RT2:
     assert json.dumps(schema, indent=2) == """{
   "type": "object",
   "required": [
-    "RT1"
+    "prop1"
   ],
   "additionalProperties": true,
   "title": "RT2",