Fixes: Widgetsgallery crashes when benchmark result is missing.
Fixes: Widgetsgallery crashes when benchmark result is missing.

RevBy: Armin Berres.

Details: While writing to CSV we're trying to access and invalid interator.
This patch makes sure that invalid iterator is not accessed.

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