fix(socket): handle missing user env

backend/chainlit/socket.py

@@ -102,6 +102,7 @@ async def resume_thread(session: WebsocketSession):
 
 
 def load_user_env(user_env):
+    user_env_dict = {}
     if user_env:
         user_env_dict = json.loads(user_env)
     # Check user env

backend/tests/test_socket.py

@@ -403,21 +403,19 @@ def test_load_user_env_none_with_required_keys(self):
         with patch("chainlit.socket.config") as mock_config:
             mock_config.project.user_env = ["API_KEY"]
 
-            # The function has a bug - it raises UnboundLocalError instead of ConnectionRefusedError
-            # Python 3.10: "referenced before assignment"
-            # Python 3.11+: "cannot access local variable"
-            with pytest.raises(UnboundLocalError, match="user_env_dict"):
+            with pytest.raises(
+                ConnectionRefusedError, match="Missing user environment variables"
+            ):
                 load_user_env(None)
 
     def test_load_user_env_none_without_required_keys(self):
         """Test when user_env is None and no keys are required."""
         with patch("chainlit.socket.config") as mock_config:
             mock_config.project.user_env = []
 
-            # The function has a bug - it raises NameError when user_env is None
-            # even when no required keys are configured
-            with pytest.raises(NameError, match="user_env_dict"):
-                load_user_env(None)
+            result = load_user_env(None)
+
+            assert result == {}
 
 
 class TestCleanSession: