Try to fix test on Travis

nyalldawson · nyalldawson · commit 0579f3e8d0aa · 2017-06-12T16:11:59.000+10:00
diff --git a/src/providers/memory/qgsmemoryprovider.cpp b/src/providers/memory/qgsmemoryprovider.cpp
@@ -352,7 +352,12 @@ bool QgsMemoryProvider::addFeatures( QgsFeatureList & flist )
     if ( it->constGeometry() )
     {
       if ( updateExtent )
-        mExtent.combineExtentWith( it->constGeometry()->boundingBox() );
+      {
+        if ( mExtent.isNull() )
+          mExtent = it->constGeometry()->boundingBox();
+        else
+          mExtent.combineExtentWith( it->constGeometry()->boundingBox() );
+      }
 
       // update spatial index
       if ( mSpatialIndex )
