Changes: Gracefully handle non-existing pages in timedemo.
Changes: Gracefully handle non-existing pages in timedemo.

RevBy: Stanislav Ionascu

Details:
Print a warning when trying to benchmark not existing page.
When there are no pages to benchmark exit.

nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch