This patch makes an icon display in image entries with broken links to
make it easier to find images with broken links.
Change-Id: I470c9959e169d4cc53a44e0a64e88af35e671db0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161045
Tested-by: Jenkins
Reviewed-by: Jim Raykowski <raykowj@gmail.com>