BehaviorTreeFactory need a function to check the tree_name if exist or not.

[Ovalgee]

If you try to create a tree by tree_name but that is not exist, the BehaviorTree.CPP will be crash

[facontidavide]

Segfault or throw an exception?

The former is a bug, the latter is the expected and desired behavior.

[facontidavide]

just added a unit test. The behavior is the expected one (exception)