Uncaught TypeError: Cannot read property 'bandwidth' of undefined in multi-period mpds

Created by: KozhinM

mpd to reproduce: http://dash.edgesuite.net/dash264/TestCases/5a/1/manifest.mpd

repro steps:

1. start the mpd
2. Seek close to the end of the second period (e.g. 2m50s)
3. Observe an exception in browser console

Details: Error occurs in ThroughtputRule.js in the following line:

var repBandwidth = this.manifestExt.getRepresentationFor(i, adaptation).bandwidth;