Bug in mbnavadjust (project close + quit)

[dwcaress]

Reported by Timo Nischik:

Hi everyone,
I've found a bug in mbnavadjust (5.8.1) where once you close an opened project
with new edits (File->Close) and after that quit the program (File->Quit) the
project's .nvh file is corrupted (almost empty) and cannot be opened again.
When quitting the software directly without closing the project prior it works
fine and apparently all edits are saved properly.
I'm working on Ubuntu 22.04.
Thank you so much for this super helpful software, I hope this issue will be
fixed in the future!
Cheers,
Timo