Update django_mongodb_backend/management/commands/showencryptedfieldsmap.py

Co-authored-by: Tim Graham <timograham@gmail.com>

Author: aclark4life

django_mongodb_backend/management/commands/showencryptedfieldsmap.py

@@ -35,6 +35,7 @@ def handle(self, *args, **options):
         db = options["database"]
         create_data_keys = options.get("create_data_keys", False)
         connection = connections[db]
+        connection.ensure_connection()
         encrypted_fields_map = {}
         with connection.schema_editor() as editor:
             for app_config in apps.get_app_configs():