The default constructor doesn't necessarily have 0 parameters,
hence we need to explicitly test for this too.

Change-Id: I685c44ab373ec8234a86824a77cc523a355c8b05
Reviewed-on: https://gerrit.libreoffice.org/19496Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>