BibFormat: format_element initialisation fix

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-0.99' into maint-1.0

* maint-0.99:
  BibFormat: format_element initialisation fix
Merge branch 'maint-1.0' into maint-1.1

* maint-1.0:
  BibFormat: format_element initialisation fix