UpdateInfo: Do not crash randomly when activating timers

Fixes QTCREATORBUG-11262

Signed-off-by: Martin Kampas <martin.kampas@jolla.com>
(cherry picked from commit b8945313b8621eeb6d3f11b66b82174c390c6df4)
Merge pull request #25 from martyone/mer-3.1

UpdateInfo: Do not crash randomly when activating timers