This guarantees one will never get `!img.isNull()` after
load()/loadFromData() has failed, even if the image was
not null before.
Apply the same fix to QPixmap and QPicture.
Change-Id: Ida1ad6a6f0fc830df8e75ada0c163fc2d3360dea
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
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