CatalogBrainContentIcon url makes no sense

[ewohnlich]

The "url" method for this class uses the value of self.brain.getIcon. But at least for Dexterity items from plone.app.contenttypes this is just a boolean, so it results in something like "http://localhost:8080/Plone/myimage/True". It doesn't look like anything in Plone core is actually using this as of 5.1.0