How to set the assignee to blank
If 1 is the prefix for the customized action, then you need:
# Set assignee value to no one, however, you must hide the field to have it take affect 1.set.assignee = 1.ignoreFields = assignee
If 1 is the prefix for the customized action, then you need:
# Set assignee value to no one, however, you must hide the field to have it take affect 1.set.assignee = 1.ignoreFields = assignee