QImage creations fails causing QPainter to fail

Need to check for QImage failure otherwise it will through a qWarning.

libs/opmapcontrol/src/mapwidget/mapgraphicitem.cpp

@@ -133,6 +133,7 @@ namespace mapcontrol
         temp=QImage(size,
                                QImage::Format_ARGB32_Premultiplied);
         temp.fill(0);
+        if (!temp.isNull()) {
             QPainter imagePainter(&temp);
             imagePainter.translate(-boundingRect().topLeft());
             imagePainter.scale(2*zoomdiff,2*zoomdiff);
@@ -141,6 +142,7 @@ namespace mapcontrol
             lastimagepoint=Point(core->GetrenderOffset().X()*2*zoomdiff,core->GetrenderOffset().Y()*2*zoomdiff);
             lastimage=temp;
         }
+    }
     void MapGraphicItem::paintImage(QPainter *painter)
     {