Only parse interface settings when they are set

interfaces/Glitter/templates/static/javascripts/glitter.main.js

@@ -1106,6 +1106,7 @@ function ViewModel() {
             self.queue.paginationLimit(response.config.misc.queue_limit.toString())
 
             // Import the rest of the settings
+            if(response.config.misc.interface_settings) {
                 var interfaceSettings = JSON.parse(response.config.misc.interface_settings);
                 self.dateFormat(interfaceSettings['dateFormat']);
                 self.extraQueueColumns(interfaceSettings['extraQueueColumns']);
@@ -1116,6 +1117,7 @@ function ViewModel() {
                 self.confirmDeleteQueue(interfaceSettings['confirmDeleteQueue']);
                 self.confirmDeleteHistory(interfaceSettings['confirmDeleteHistory']);
             }
+        }
 
         // Set bandwidth limit
         if(!response.config.misc.bandwidth_max) response.config.misc.bandwidth_max = false;