Fixed API test cases failed due to commit for #4979.

web/pgadmin/browser/server_groups/servers/tests/test_shared_server.py

@@ -17,8 +17,9 @@ from regression.python_test_utils.test_utils import \
     create_user_wise_test_client
 import config
 
-test_user_details = config_data[
-    'pgAdmin4_test_non_admin_credentials']
+test_user_details = None
+if config.SERVER_MODE:
+    test_user_details = config_data['pgAdmin4_test_non_admin_credentials']
 
 
 class SharedServersGetTestCase(BaseTestGenerator):