Can't navigate out of removed directory [server crash]

[spyysalo]

To replicate:

• create a directory structure at least two deep, e.g. GREC/Ecoli under data
• navigate to the deepest level in the collection browser
• delete the directory on the file system
• try to navigate "up" in the collection browser

Results in server crash with

Error listing /home/smp/public_html/brat/data/GREC/Ecoli/: [Errno 2] No such file or directory: '/home/smp/public_html/brat/data/GREC/Ecoli/'
Error accessing collection /home/smp/public_html/brat/data/GREC/Ecoli/

and the client remains stuck in the non-existent directory.

low priority as this is unlikely to occur in practice.

[spyysalo]

Too rare and minor an issue to care for The Larch, postponing.