BibDocFile: undefined variable fix

• Fixes internal server error when directories are missing on the filesystem.

• Applies fix from 'pu' to 'master'. The fix was overwritten by the recent large master to next merge (eefac3e73d8dd5b7c5ac1a47cb298431f4a8662f).

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>