GUACAMOLE-288: Force disconnect on error to avoid dead browser windows.

Author: corentin-soriano

guacamole-common-js/src/main/webapp/modules/Client.js

@@ -1404,6 +1404,8 @@ Guacamole.Client = function(tunnel) {
             if (guac_client.onerror)
                 guac_client.onerror(new Guacamole.Status(code, reason));
 
+            if (guac_client.ondisconnect) guac_client.ondisconnect();
+
             guac_client.disconnect();
 
         },