I have a database with many vacation rental properties accross the us. I created a dynamic page that displays the properties in a specific city. When I go to the dynamic page for something like "/properties/Boston/MA/US" and I have properties there, the page pulls up fine and displays the properties. However, if I don't have properties in the database for a specific city and the visitor goes to that page like "/properties/Dallas/TX/US" then a I get a "Page does not exist error". What I would like to do is to display the city page but just show a message that says "No properties found. Add your property". I'm assuming this can be accomplished with hooks, but just not sure exactly what type of hook. If someone could give me a little direction on this that would be great. Thanks.