Merge pull request #78 from BCLab-UNM/hotfix-gui-segfault-on-close

Don't crash on close when popout map is open

Author: gmfricke

src/rqt_rover_gui/src/MapFrame.cpp

@@ -516,7 +516,10 @@ void MapFrame::paintEvent(QPaintEvent* event) {
     else painter.setPen(Qt::yellow);
 
     pair<float,float> current_coordinate;
-    current_coordinate = map_data->getEKFPath(rover_to_display)->back();
+    if(! map_data->getEKFPath(rover_to_display)->empty() )
+    {
+       current_coordinate = map_data->getEKFPath(rover_to_display)->back();
+    }
 
     float x = map_origin_x+((current_coordinate.first-min_seen_x)/max_seen_width)*(map_width-map_origin_x);
     float y = map_origin_y+((current_coordinate.second-min_seen_y)/max_seen_height)*(map_height-map_origin_y);