Bind outside of the try block

If binding fails, we don't want to unbind
since there will be nothing bound, so do
the binding outside of the try/except
block to do this in the correct order.

Change-Id: Iebd3ea7a04265264043c47d4e943778538e8a153

taskflow/engines/action_engine/executor.py

@@ -29,8 +29,8 @@ from taskflow.utils import threading_utils
 
 @contextlib.contextmanager
 def _autobind(task, bind_name, bind_func, **kwargs):
+    task.bind(bind_name, bind_func, **kwargs)
     try:
-        task.bind(bind_name, bind_func, **kwargs)
         yield task
     finally:
         task.unbind(bind_name, bind_func)