engine: Invalid locale found in configuration ''

- Fixed info message warning showing up in log. This was due
  to missing entry in database, and missing check for blank.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1165073
Change-Id: Icae51fdd5427069281ac3d2147af797813228edb
Signed-off-by: Alexander Wels <awels@redhat.com>