The crash affects Windows, not Linux where an error popup appears instead (MacOs?)
It seems the fact the url was empty triggers an exception in ucbhelper::Content ctr
So let's put the lines in the try catch and log the exception.
See comments of bugtracker for slight more details.

Change-Id: I60e55be488632ff6e0106fde832a818c6431f58e
Reviewed-on: https://gerrit.libreoffice.org/71321
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-on: https://gerrit.libreoffice.org/71593