[PUSHED] Print help text if no subcommand is provided

[Eike Rathke (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/2541

Approvals:
  Thomas Arnhold: Looks good to me, but someone else must approve
  Eike Rathke: Verified; Looks good to me, approved


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To view, visit https://gerrit.libreoffice.org/2541
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Gerrit-MessageType: merged
Gerrit-Change-Id: Id9abc3ab45af8b6e44904090e179ce67a3f45796
Gerrit-PatchSet: 3
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Philipp Weissenbacher <p.weissenbacher at gmail.com>
Gerrit-Reviewer: Eike Rathke <erack at redhat.com>
Gerrit-Reviewer: Thomas Arnhold <thomas at arnhold.org>