Fixes: NB#221478 - Segfault when deleting QApplication explicitly
Fixes: NB#221478 - Segfault when deleting QApplication explicitly

RevBy: Stanislav Ionascu, Armin Aberres, Adrian Yanes
Details:
Check the existence of the invalid pixmap and avoid unnecesarily recreating it.

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