Blank request can get sent after disconnection (depending on timing)

[Steve Jang]

In the following code (core.js, inside _onIdle, line 3589):

    if (this._requests.length < 2 && this._data.length > 0 &&
        !this.paused) {
        ...
        this._requests.push(   // <--------------- line 3589
            new Strophe.Request(body.tree(),
                                this._onRequestStateChange.bind(
                                    this, this._dataRecv.bind(this)),
                                body.tree().getAttribute("rid")));
        this._processRequest(this._requests.length - 1);
    }

Depending on timing, this code seems to queue a poll request even after "terminate" message has been processed. This results in 404 being returned from server, and causes uncaught exception: TypeError: elem.getAttribute is not a function.

Perhaps, we should check for this.disconnecting variable before queuing a new request?

Here is a quick fix for this problem. However, a better fix should be possible:

        if (!this.disconnecting) {
            this._requests.push(
                new Strophe.Request(body.tree(),
                                    this._onRequestStateChange.bind(
                                        this, this._dataRecv.bind(this)),
                                    body.tree().getAttribute("rid")));
        }
        if (this._requests.length > 0) {
            this._processRequest(this._requests.length - 1);
        }