FIX: Curator should ignore empty list

[weslambert]

While debugging an issue with Curator not deleting for space (#10464), I noticed hundreds of lines like:

2023-06-01 14:10:38,175 ERROR Unable to complete action "close". No actionable items in list: <class 'curator.exceptions.NoIndices'>
2023-06-01 14:10:52,986 ERROR Unable to complete action "close". No actionable items in list: <class 'curator.exceptions.NoIndices'>

They were all the close and warm actions, whereas the delete actions all showed something like:

2023-06-01 14:10:06,118 INFO Skipping action "delete_indices" due to empty list: <class 'curator.exceptions.NoIndices'>

Obviously, this is an expected outcome, and not a true error, but it appears the delete action uses ignore_empty_list: True whereas the close and warm actions use continue_if_exception: False.

Security Onion Solutions devs, is there a reason behind this? If not, would it make sense to use ignore_empty_list: True on all actions? In my testing, changing selected close actions to ignore_empty_list: True removes the error and I haven't noticed any ill effects. Being able to search the log for 'ERROR' and only see actual errors would make troubleshooting easier.

Originally posted by @petiepooo in #10496

[weslambert]

#10541