[trees] bugfix missing keys in publications (#118)

splintered-reality · Oct 7, 2019 · 65d898d · 65d898d
1 parent 45a69e8
commit 65d898d
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/py_trees_ros/trees.py b/py_trees_ros/trees.py
@@ -381,12 +381,17 @@ def _publish_serialised_tree(self):
             client_ids=self.snapshot_visitor.visited.keys()
         )
         for key in visited_keys:
+            try:
+                value = str(py_trees.blackboard.Blackboard.get(key))
+            except KeyError:
+                value = "-"
             tree_message.blackboard_on_visited_path.append(
                 diagnostic_msgs.KeyValue(
                     key=key,
-                    value=str(py_trees.blackboard.Blackboard.get(key))
+                    value=value
                 )
             )
+
         if py_trees.blackboard.Blackboard.activity_stream is not None:
             tree_message.blackboard_activity_stream = py_trees.display.unicode_blackboard_activity_stream()
         # other