Log user's search term if nothing is found; #34 (and #27)

js/tubmap.js

@@ -1040,6 +1040,9 @@ function search(input_value) {
         
         $("#modal-content").html(frameHTML);
         $("#modal").show();
+        
+        // Log data to improve search field later
+        log('searchterm', input_value);
     }
 }