Zellij crashes on re-attachment if the initial working directory does not exist anymore

[julianbuettner]

Issue description

I started a zellij terminal session, changed directories a few times and at one time moved the directory in which I started the session.
I detached and attached again, which resulted in a crash.

Minimal reproduction

1. Create a test directory and enter it
2. Start a zellij session and change directory to e.g. home
3. Delete/move the test directory
   4a. Detach and reattach to see a crash
   4b. Create a new tab to see a frozen status bar or other buggy behaviour

(Tested on v0.39.2 on two different linux systems, arch and debian.)

Logs

The logs did not provide much useful information and the reproduction is done in less then a minute, so I decided not to include them.