v3.1 user-defined keywords not deleted

[janrif]

# User-defined keywords not deleted after last one is unchecked.

One of my custom keywords is 'food'. This is a keyword I want to get rid of in the list. I did a quick search user defined keywords for 'food'. No items came up yet 'food' remains (un-checked) in the list. How do I get rid of it? Thank you.