Difficulties generating dot file for graphs with blackboards

[correll]

The basic Blackboard demo currently does not work. When running

py_trees.display.render_dot_tree(root, with_blackboard_variables=True)

I get the following error:

File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/py_trees/display.py", line 649, in render_dot_tree
graph = dot_tree(
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/py_trees/display.py", line 602, in dot_tree
add_blackboard_nodes(blackboard_id_name_map)
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/py_trees/display.py", line 588, in add_blackboard_nodes
clients[unique_identifier].getattribute("name"),
AttributeError: 'str' object has no attribute 'name'