Show custom post archive when custom post not specified

I have a custom post type called produce set up in WordPress and a custom taxonomy called produce_category. The URL format for posts in this custom post type is in this format http://mywebsite/produce/%produce_category%/%postname%/. Of course %produce_category% and %postname% get substituted accordingly, a working example url would be http://mywebsite/produce/fruits-and-vegetables/avocado. What I would like to do is…

Details