Fixes: NB#160550 DuiLabel::setText() does not work when using "" as a parameter.
Fixes: NB#160550 DuiLabel::setText() does not work when using "" as a parameter.

RevBy: DUI team Symbio (JH)

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