Uses 'null' in JitsiTrack.detach, but sets empty string in Chrome implementation when the src is not specified.

modules/RTC/JitsiTrack.js

@@ -192,7 +192,7 @@ JitsiTrack.prototype.detach = function (container) {
     {
         if(!container)
         {
-            require("./RTCUtils").setVideoSrc(this.containers[i], '');
+            require("./RTCUtils").setVideoSrc(this.containers[i], null);
         }
         if(!container || $(this.containers[i]).is($(container)))
         {
@@ -201,7 +201,7 @@ JitsiTrack.prototype.detach = function (container) {
     }
 
     if(container) {
-        require("./RTCUtils").setVideoSrc(container, '');
+        require("./RTCUtils").setVideoSrc(container, null);
     }
 }
 

modules/RTC/RTCUtils.js

@@ -505,6 +505,9 @@ var RTCUtils = {
                     return element.getAttribute("src");
                 };
                 this.setVideoSrc = function (element, src) {
+                    if (!src) {
+                        src = '';
+                    }
                     if (element)
                         element.setAttribute("src", src);
                 };