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Audio only stream causes exception in ControlBar.js that prevents playback

Created by: matt-hammond-001

Environment
Steps to reproduce
  1. Open the v2.3.0 reference player
  2. Select an audio only MPD, and click "load" to begin playback
Observed behaviour

DASH stream does not commence playback due to exception raised by ControlBar.js

This appears to be because this line in ControlBar.js uses an if statement that assumes there are both video and audio tracks:

if (availableBitrates.audio.length > 1 || availableBitrates.video.length > 1) {

availableBitrates.video is null, causing the reference to availableBitrates.video.length to raise an exception

Console output
Debug.js:108[10] EME detected on this user agent! (ProtectionModel_21Jan2015) 
Debug.js:108[16] [dash.js 2.3.0] MediaPlayer has been initialized 
Debug.js:108 [2665] Playback Initialized 
Debug.js:108 [3021] Parsing complete: ( xml2json: 2.32ms, objectiron: 0.725ms, total: 0.00305s) 
Debug.js:108 [3022] Manifest has been refreshed at Thu Sep 08 2016 12:31:08 GMT+0100 (BST)[1473334268.555]  
Debug.js:108 [11985] Matching default timing source protocol to manifest protocol:  http://time.akamai.com/?iso 
Debug.js:108 [12041] Local time:      Thu Sep 08 2016 12:31:17 GMT+0100 (BST) 
Debug.js:108 [12042] Server time:     Thu Sep 08 2016 12:31:16 GMT+0100 (BST) 
Debug.js:108 [12042] Difference (ms): -1574 
Debug.js:108 [12046] MediaSource attached to element.  Waiting on open... 
Debug.js:108 [12054] MediaSource is open! 
Debug.js:108 [12054] Duration successfully set to: 1.7976931348623157e+308 
Debug.js:108 [12055] Added 0 inline events 
Debug.js:108 [12056] No video data. 
Debug.js:108 [12056] audio codec: audio/mp4;codecs="mp4a.40.2" 
Debug.js:108 [12066] Schedule controller stopping for audio 
Debug.js:108 [12070] No text data. 
Debug.js:108 [12070] No fragmentedText data. 
Debug.js:108 [12070] No embeddedText data. 
Debug.js:108 [12070] No muxed data. 
    onStreamInitialized @ ControlBar.js:287
    (anonymous function) @ EventBus.js:87
    trigger @ EventBus.js:87
    checkIfInitializationCompleted @ Stream.js:457
    initializeMedia @ Stream.js:437
    activate @ Stream.js:124
    onMediaSourceOpen @ StreamController.js:427