* Item returns Empty if key does not exist, no error is raised
* replaced LibreOffice by %PRODUCTNAME
* use the same capitalization of PropertyValue as in other places
Change-Id: I45f9cfa873e0931a9bdf35d54a63b7591721e221
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/128190
Tested-by: Jenkins
Reviewed-by: Rafael Lima <rafael.palma.lima@gmail.com>