Fix HTTP 500 error in ObjectSerializer by handling non-serializable objects gracefully

Co-authored-by: alexta69 <7450369+alexta69@users.noreply.github.com>

app/main.py

@@ -123,10 +123,14 @@ class ObjectSerializer(json.JSONEncoder):
         elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes)):
             try:
                 return list(obj)
-            except:
-                pass
-        # Fall back to default behavior
-        return json.JSONEncoder.default(self, obj)
+            except (TypeError, ValueError, RuntimeError):
+                # If conversion to list fails, log a warning and return a placeholder
+                log.warning(f"Failed to convert {type(obj).__name__} to list, using string representation")
+                return str(obj)
+        # For objects that can't be serialized, return their string representation
+        # This prevents HTTP 500 errors while still providing useful information
+        log.warning(f"Object of type {type(obj).__name__} is not directly JSON serializable, using string representation")
+        return str(obj)
 
 serializer = ObjectSerializer()
 app = web.Application()