thrimbletrimmer: Handle getting trim time when no valid trim time is set

Just return null instead

thrimbletrimmer/scripts/IO.js

@@ -248,6 +248,9 @@ thrimbletrimmerSubmit = function(state) {
     console.log(wubData);
     console.log(JSON.stringify(wubData));
 
+	if (!wubData.video_start) {alert("No start time set"); return;}
+	if (!wubData.video_end) {alert("No end time set"); return;}
+
     //Submit to thrimshim
     var rowId = /id=(.*)(?:&|$)/.exec(document.location.search)[1];
     fetch("/thrimshim/"+rowId, {

thrimbletrimmer/scripts/playerSetup.js

@@ -88,5 +88,7 @@ getRealTimeForPlayerTime = function(discontinuities, playbackIndex) {
         playbackIndex -= lastDiscontinuity.playbackIndex;
     }
 
-    return new Date(streamStart.getTime()+playbackIndex*1000).toISOString();
+	var realTime = streamStart.getTime()+playbackIndex*1000;
+
+    return (isFinite(realTime)) ? new Date(realTime).toISOString() : null;
 };