BibAuthorID: Fix APPP title name display

* The selection of the most relevant name to be
  used as a title for the APPP does not crash
  anymore when handling empty names.

Signed-off-by: Samuele Carli <samuele.carli@cern.ch>
Signed-off-by: Artem Tsikiridis <artem.tsikiridis@cern.ch>