Fix startup when no write permissions

[fffergal]

Making the parent directories of the config file could cause an exception if the process doesn't have write permissions. This is common with remote debugging in containers. Catch exceptions, log, and continue, same as other parts of the settings that cannot raise exceptions. The next stage of saving the config file will also fail, but this is already caught.

[fffergal]

Was waiting for checks to run before making ready, but I don't think they are going to run without intervention so making ready now. Anything I can do to make this easier to merge and release, just let me know! Thank you.

[inducer]

Thanks!

[fffergal]

Thanks for accepting! I've played around with it a bit like this. I can get into debugging now, but there are errors that appear in the console fairly often, and a pop up when you try to quit. Ctrl-c still works. So I may add some other fix ups later.

[inducer]

Sounds good. Happy to consider further PRs. And thanks for contributing!