I'm working on a site for a client who wants agents they work with to have subpages on their site with the optional capability for them to add some of their own branding (colours, logo) to these pages. Ideally, I would be able to have a coloured band running atop the page if their hex colour was set, but no band at all if not. Can work around with checkboxes, but the CMS is Zapiered to Airtable so simplicity is preferable. Obviously, making elements visible conditional on where on the colour spectrum they fit is a far edge case; but it would be nice to have the option to filter based on whether the field is set at all!