Issue postwait#445: Guard against unknown exchange name in queue.unbi…

…nd().

Do not touch this._bindings but execute the command against the
connection anyway, assuming that the caller knows what they are
doing.

lib/queue.js

@@ -266,15 +266,17 @@ Queue.prototype.unbind = function (exchange, routingKey) {
 
   var exchangeName = exchange instanceof Exchange ? exchange.name : exchange;
 
-  // Decrement binding count.
-  this._bindings[exchangeName][routingKey]--;
-  if (!this._bindings[exchangeName][routingKey]) {
-    delete this._bindings[exchangeName][routingKey];
-  }
+  if(this._bindings[exchangeName]) {
+    // Decrement binding count.
+    this._bindings[exchangeName][routingKey]--;
+    if (!this._bindings[exchangeName][routingKey]) {
+      delete this._bindings[exchangeName][routingKey];
+    }
 
-  // If there are no more bindings to this exchange, delete the key for the exchange.
-  if (!_.keys(this._bindings[exchangeName]).length){
-    delete this._bindings[exchangeName];
+    // If there are no more bindings to this exchange, delete the key for the exchange.
+    if (!_.keys(this._bindings[exchangeName]).length){
+      delete this._bindings[exchangeName];
+    }
   }
 
   return this._taskPush(methods.queueUnbindOk, function () {

test/test-unbind-unknown-exchange.js

@@ -0,0 +1,27 @@
+var conn = require('./harness').createConnection();
+
+var caughtError = false;
+
+var later = function(fun) {
+    setTimeout(fun, 500);
+};
+conn.once('ready', function () {
+  puts("connected to " + conn.serverProperties.product);
+
+  var q = conn.queue('node-simple-queue');
+
+  try {
+    q.unbind('unknown-exchange', 'routing-key');
+  } catch(e) {
+    caughtError = true;
+  }
+
+  later(function() {
+    conn.end();
+    process.exit();
+  });
+});
+
+process.addListener('exit', function () {
+    assert.equal(caughtError, false);
+});