fixes RecursionError

Author: zrq495

swagger_py_codegen/jsonschema.py

@@ -197,7 +197,9 @@ def _normalize_dict(schema, data):
 
             # get value
             value, has_key = data.get_check(key)
-            if has_key or '$ref' in _schema:
+            if has_key and '$ref' in _schema:
+                result[key] = _normalize(_schema, value)
+            elif has_key:
                 result[key] = _normalize(_schema, value)
             elif 'default' in _schema:
                 result[key] = _schema['default']