Check if no faces are available for picking in mesh node

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@5459 383ad7c9-94d9-4d36-a494-682f7c89f535

ACG/Scenegraph/MeshNodeT.cc

@@ -1234,12 +1234,19 @@ pick_faces(GLState& _state)
   typename Mesh::ConstFaceVertexIter  fv_it;
 
 
-  if (!_state.pick_set_maximum (mesh_.n_faces()))
-  {
-    omerr() << "MeshNode::pick_faces: color range too small, "
-	    << "picking failed\n";
-    return;
-  }
+  if ( mesh_.n_faces() > 0 )
+    if (!_state.pick_set_maximum (mesh_.n_faces()))
+    {
+      omerr() << "MeshNode::pick_faces: color range too small, "
+        << "picking failed\n";
+      return;
+    }
+  else
+    if (!_state.pick_set_maximum (1))
+    {
+      omerr() << "Strange pickSetMAximum failed for index 1 in MeshNode\n";
+      return;
+    }
 
   if (faceList_ && !updateFaceList_ && _state.pick_current_index () == faceBaseIndex_)
   {