Fixed missing newline at the end of oldmodels.py

Author: gnofs

src/cbapi/oldmodels.py

@@ -328,4 +328,4 @@ def _join(self, join_cls, field_name):
         if field_value is None:
             return None
 
-        return self._cb.select(join_cls, field_value)
+        return self._cb.select(join_cls, field_value)