return code in django_manage_shell for old django versions

(cherry picked from commit c68f2317b36516c93e6095f3e0c836c729b5ebdc)

python/helpers/pycharm/django_manage_shell.py

@@ -16,6 +16,11 @@ def run(working_dir):
   if not manage_file:
     manage_file = 'manage'
 
+  def execute_manager(settings_mod, argv = None):
+      management.setup_environ(settings_mod)
+
+  management.execute_manager = execute_manager
+
   def execute_from_command_line(argv=None):
     pass