Android: Fix crash when using images in QML

Android: Fix crash when using images in QML

Because qtdeclarative was merged back from stable and qtbase is
still lagging behind, they have become unsynchronized, causing
crashes when trying to get the device name from the platform
plugin and failing. To work around this until the merge goes
through, I've added a simple guard.

Task-number: QTBUG-36658
Change-Id: Ibc399ed325a1fbdeccad85ed8d4841edb7b2ba5d
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>