return early without error if no shape it selected on generating preview

of current selection. Which can arise in calc on repeatedly
double-clicking on a shape and pressing esc. Eventually there will
be a case where the shape isn't selected by the time the preview
generation is attempted.

Change-Id: Ic92149b5e12f35fe69265b6c8df289819313a899
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163942
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>

0 files changed, 0 insertions, 0 deletions