baloosearchruner: Emit DBus error when baloo is disabled
Otherwise we exit and KRunner runner into a long timeout. By making this a dedicated DBus error KRunner can also know, that this runner can not be started. Consequently making new attempts to query this runner can be prevented. Because the runner is DBus-Activated, we can not exit the process, otherwise other processes (like the search in the app launcher) will have the same issue with the timeout. BUG: 445342 (cherry picked from commit fa5ac3fe)
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