fix: web socket url generation

Author: snitin315

lib/utils/DevServerPlugin.js

@@ -51,8 +51,10 @@ class DevServerPlugin {
       port = `&port=${options.client.port}`;
     } else if (options.webSocketServer.options.port && !isSockJSType) {
       port = `&port=${options.webSocketServer.options.port}`;
-    } else {
+    } else if (options.port) {
       port = `&port=${options.port}`;
+    } else {
+      port = '';
     }
 
     /** @type {string} */