fpyc remove cmd return val from stack when not used

[zimri-leisher]

F´ Version	4.1.0
Affected Component	fpyc

---

Feature Description

Commands push their return statuses onto the stack. If that return status isn't used, it just stays on the stack forever. This could cause a stack overflow if you executed many commands.

[zimri-leisher]

solution:
probably just discard this if not used?

[zimri-leisher]

Closed by #4149