[Bug 53373] No error when file doesn't exist.

[Lukas Sabota]

Public bug reported:

I'm running the latest Ubuntu edgy on x86.  To reproduce:

1) Have a file named foo.ogg.
2) Add foo.ogg into serpentine.
3) Rename foo.ogg to foobar.ogg
4) Press "Burn" in serpentine
Serpentine will display no error message, but a long traceback in the terminal.  Serpentine should check to make sure all files exist, and notify the user of files that no longer exist.

** Affects: serpentine (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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No error when file doesn't exist.
https://launchpad.net/bugs/53373