Give topic a default value if not supplied

squaremo · squaremo · commit 1698f8c0fb4e · 2014-03-13T00:23:03.000Z
It's possible to use SubSocket#connect without a callback *or* topic,
in which case it ought to use an empty string for the topic.
diff --git a/lib/sockets.js b/lib/sockets.js
@@ -218,9 +218,9 @@ addSocketMethods(SubSocket);
 SubSocket.prototype.connect = function(source, topic, callback) {
   // Support the general form of connect
   if (callback === undefined && typeof topic === 'function') {
-    callback = topic;
-    topic = '';
-  }
+    callback = topic; topic = '';
+  } else topic = topic || '';
+
   var ch = this.ch, queue = this.queue, self = this;
   ch.assertExchange(source,
                     this.options.routing || 'fanout',
