Fixed #1605.

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@10448 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

src/core/qgsgeometry.cpp

@@ -312,6 +312,9 @@ static GEOSGeometry *createGeosLineString( const QgsPolyline& polyline )
 static GEOSGeometry *createGeosLinearRing( const QgsPolyline& polyline )
 {
   GEOSCoordSequence *coord = 0;
+  
+  if (polyline.count() == 0)
+    return 0;
 
   try
   {