`Cut Side` value was hard-coded to reset when Base Geometry was empty. This disallowed retention of the current value with changes to selected Base Geometry involving the clearing thereof.
Also restored fixed visibility to `Cut Side` option in Task panel editor per forum mention.
This `ns` fix might need further attention after testing. The section to which it pertains deals with optimizing rotations between ops with similar rotational axes.
Existing code to determine if shape volume indeed existed, failed.
Added additional pre-check for existing edges in shape to determine if shape geometry indeed exists.
In forum:
[Ticket #4411 - Can only generate pocket once for this shape, then it fails.](https://forum.freecadweb.org/viewtopic.php?style=3&f=15&t=49035).