fixed typo (caused DropCutter to return no results)

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@731 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/PathGenerators/DropCutter.py

@@ -46,7 +46,7 @@ def _process_one_grid_line((positions, minz, maxz, dim_attrs, model, cutter, phy
             result = get_max_height_triangles(model, cutter, x, y, minz, maxz,
                     order=dim_attrs[:], last_pos=last_position)
         if result:
-            points.extend(points)
+            points.extend(result)
         else:
             points.append(Point(x, y, safety_height))
             height_exceeded = True