set start 0 if availabilityWindow.start = null
Created by: arpu
fixes: dash.all.debug.js:20787 Uncaught TypeError: Cannot read property 'start' of null at decideSegmentListRangeForTemplate (dash.all.debug.js:20787) at Object.getSegmentsFromTemplate [as getSegments] (dash.all.debug.js:20907) at Object.getSegments (dash.all.debug.js:20499) at updateSegments (dash.all.debug.js:16039) at updateSegmentList (dash.all.debug.js:16066) at Object.updateRepresentation (dash.all.debug.js:16077) at Object.updateData (dash.all.debug.js:18003) at Object.updateData (dash.all.debug.js:15662) at Object.updateMediaInfo (dash.all.debug.js:26537) at createStreamProcessor (dash.all.debug.js:26016)
start a player before start the stream (create the mpd file)