Cannot go up a level when an upper directory has been deleted

[birdie]

Steps to reproduce

• mkdir -p /tmp/1/2
• navigate to /tmp/1/2 in MC
• rm -rf /tmp/1
• try to go up a level in MC -> Error "Cannot change directory"

To be honest I don't know what the best solution could be. I just don't like the fact that the user is stuck in this situation. Of course you can type "cd /some/other/dir" but many don't know about it. You can also exit MC.

Maybe MC could show a prompt, "MC cannot go up a level, do you want to enter the root directory instead, Yes/No?".

Or maybe try going even higher-level directories but that's a recipe for disaster. Imagine it's a deep network path, /mnt/net/1/2/3/4/5/6/7/8 and each attempt of opening a directory could lead to a 2 minutes time out - not good.