BibSched: fix problem with --post-process option
BibSched: fix problem with --post-process option

* Fixes a problem when using the short option '-p' in tasks (e.g. webcoll)
  that was recognized as a post-process option and threw an exception.

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio