Errors thrown by connect() of a chained tunnel should be resent to onerror() if caught within ChainedTunnel.attach().

guacamole-common-js/src/main/resources/tunnel.js

@@ -729,9 +729,20 @@ Guacamole.ChainedTunnel = function(tunnel_chain) {
 
         };
 
+        try {
+            
             // Attempt connection
             current_tunnel.connect(connect_data);
             
+        }
+        catch (e) {
+            
+            // Call error handler of current tunnel on error
+            current_tunnel.onerror(e.message);
+            
+        }
+
+
     }
 
     this.connect = function(data) {