deal with missing profile

app.py

@@ -17,8 +17,14 @@ COURSE_TITLE = os.getenv("COURSE_TITLE", "AI Agents Fundamentals")
 
 def download_profile_picture(profile_url: str):
     """Download profile picture from URL."""
-    response = requests.get(profile_url)
-    return Image.open(BytesIO(response.content))
+    try:
+        response = requests.get(profile_url)
+        response.raise_for_status()  # Ensure we got a proper response
+        return Image.open(BytesIO(response.content))
+    except Exception as e:
+        print(f"Error downloading profile picture from {profile_url}: {e}")
+        # Return a default fallback image (a plain white 100x100 image)
+        return Image.new("RGB", (100, 100), color="white")
 
 
 def generate_certificate(certificate_path: str, name: str, profile_url: str):