BibDocFile: raise exception in _build_file_list()

Signed-off-by: Ludmila Marian <ludmila.marian@gmail.com>
Reviewed-by: Samuele Kaplun <samuele.kaplun@cern.ch>
BibEncode: minor fix in process_batch_job()

Signed-off-by: Ludmila Marian <ludmila.marian@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
BibDocFile: improve BibDoc display in Files tab

* If a BibDoc does not contain any visible files, do not show
  the doctype label.

Signed-off-by: Ludmila Marian <ludmila.marian@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  BibEncode: minor fix in process_batch_job()