update from DuongTD

plugins/inflation_layer.cpp

@@ -198,7 +198,8 @@ void InflationLayer::updateCosts(robot_costmap_2d::Costmap2D& master_grid, int m
     return;
 
   // make sure the inflation list is empty at the beginning of the cycle (should always be true)
-  printf("The inflation list must be empty at the beginning of inflation\n");
+  if(!inflation_cells_.empty())
+    printf("The inflation list must be empty at the beginning of inflation\n");
 
   unsigned char* master_array = master_grid.getCharMap();
   unsigned int size_x = master_grid.getSizeInCellsX(), size_y = master_grid.getSizeInCellsY();