Whenever a blank space indicator (or an old-style "empty" indicator) is encountered, store it as underscore into bibxxx tables.
Whenever a blank space indicator (or an old-style "empty" indicator)
is encountered, store it as underscore into bibxxx tables.

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