fix test run logging

Author: nilsmechtel

bioimageio_colab/register_sam_service.py

@@ -156,8 +156,9 @@ def test_model(cache_dir: str, model_name: str, context: dict = None) -> dict:
     """
     Test the segmentation service.
     """
-    user_id = context["user"] if context else {"id": "anonymous"}
+    user_id = context["user"].get("id") if context else "anonymous"
     logger.info(f"User '{user_id}' - Test run for model '{model_name}'...")
+    
     image = np.random.rand(1024, 1024)
     embedding = compute_image_embedding(
         cache_dir=cache_dir,