Audio only on IE/Edge w/ PlayReady

Created by: qchroman

Hello all,

I found an issue with audio only PR protected MPEG-DASH assets.

Following line inside ProtectionModel_3Feb2014.js causes IE/Edge to throw an error saying it can't get the length of undefined.

if (keySystemAccess.ksConfiguration.videoCapabilities !== null && keySystemAccess.ksConfiguration.videoCapabilities.length > 0)
    capabilities = keySystemAccess.ksConfiguration.videoCapabilities[0];

Made a quick fix

if (!keySystemAccess.ksConfiguration.videoCapabilities)
    keySystemAccess.ksConfiguration.videoCapabilities = null;

if (keySystemAccess.ksConfiguration.videoCapabilities !== null && keySystemAccess.ksConfiguration.videoCapabilities.length > 0)
    capabilities = keySystemAccess.ksConfiguration.videoCapabilities[0];

Which fixed the issue. Hope this helps.