A GError needs a valid GQuark as the domain. Passing 0 leads to:
  GLib-WARNING **: (gerror.c:408):g_error_new_valist: runtime check
    failed: (domain != 0)

Change-Id: I2f252eaa83a1519b5d16c7ba22c8f593732807ca
Reviewed-on: https://gerrit.libreoffice.org/21261Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Pranav Kant <pranavk@gnome.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>