Print errors comming from callv
Created by: bojidar-bg
Fixes #18386 (closed).
Additionally, changed a bit how space for the arguments is allocated, making it similar to MessageQueue::_call_function
:
https://github.com/godotengine/godot/blob/e761af57949a81a680551159344180b561d3d528/core/message_queue.cpp#L245-L253