Allow invalid URL parameters in meeting create

bigbluebutton/api/attendee.py

@@ -189,6 +189,7 @@ class Attendee:
                     raise ValueError("createTime does not match actual meeting parameters")
             else:
                 snake_name = camel_to_snake(name)
-                kwargs[snake_name] = to_field_type(cls, snake_name, value)
+                if hasattr(cls, snake_name):
+                    kwargs[snake_name] = to_field_type(cls, snake_name, value)
 
         return kwargs