These areas are zero when you start to draw a 3D object with the mouse.

Change-Id: I003ec06b42351b5c4b2b59b9f908fb82ab6e9b35
Reviewed-on: https://gerrit.libreoffice.org/71373
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>