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

@@ -133,13 +133,15 @@ namespace mapcontrol
         temp=QImage(size,
                                QImage::Format_ARGB32_Premultiplied);
         temp.fill(0);
-        QPainter imagePainter(&temp);
-        imagePainter.translate(-boundingRect().topLeft());
-        imagePainter.scale(2*zoomdiff,2*zoomdiff);
-        paintImage(&imagePainter);
-        imagePainter.end();
-        lastimagepoint=Point(core->GetrenderOffset().X()*2*zoomdiff,core->GetrenderOffset().Y()*2*zoomdiff);
-        lastimage=temp;
+        if (!temp.isNull()) {
+            QPainter imagePainter(&temp);
+            imagePainter.translate(-boundingRect().topLeft());
+            imagePainter.scale(2*zoomdiff,2*zoomdiff);
+            paintImage(&imagePainter);
+            imagePainter.end();
+            lastimagepoint=Point(core->GetrenderOffset().X()*2*zoomdiff,core->GetrenderOffset().Y()*2*zoomdiff);
+            lastimage=temp;
+        }
     }
     void MapGraphicItem::paintImage(QPainter *painter)
     {