Instead of either hard-depending on Tracker being installed, or crashing when the Tracker GSettings schema is not found, make the configuration insensitive if the schema is not available. https://bugzilla.gnome.org/show_bug.cgi?id=687490
Ideally applications could configure Tracker independent from each other, but we don't have such a feature currently. In the meanwhile, bring up a settings dialog that can allow configuration of the locations indexed by the Tracker files miner, as suggested by the current design. https://live.gnome.org/Design/SystemSettings/Search https://bugzilla.gnome.org/show_bug.cgi?id=687490