Fix lbshell crashing if no available items in an external menu. Also fix not...

Fix lbshell crashing if no available items in an external menu. Also fix not honoring the "pause after execution" setting on an external program.

https://gitlab.synchro.net/sbbs/sbbs/-/issues/169 https://gitlab.synchro.net/sbbs/sbbs/-/issues/124

enabled an automatic merge when the pipeline for 00817939 succeeds

mentioned in commit 030e3513

merged