[Bug 48231] crash if temp_iso_dir doesn't exist

[Reinhard Tartler]

Public bug reported:

I've set the gconf key /apps/nautilus-cd-burner/temp_iso_dir to another
place, because my root partition was rather small. now the tmpdir has
moved, and I forgot to adapt this tmp directory. It took me quite a
while to realize that this is the reason nautilus crashes all the time I
want to burn a cd.

nautilus-cd-burner should handle this error more gracefully instead of
just segfaulting

** Affects: nautilus-cd-burner (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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crash if temp_iso_dir doesn't exist
https://launchpad.net/bugs/48231