[FragmentStream] Fix destruction

Author: hparra

src/com/pivotshare/hls/loader/FragmentStream.as

@@ -83,11 +83,12 @@ package com.pivotshare.hls.loader {
  * @method close
  */
  public function close() : void {
+
  if (_fragmentURLStream && _fragmentURLStream.connected) {
  _fragmentURLStream.close();
  }
 
- if (_fragment) {
+ if (_fragment && _fragment.data) {
 
  if (_fragment.data.decryptAES) {
  _fragment.data.decryptAES.cancel();
@@ -96,8 +97,10 @@ package com.pivotshare.hls.loader {
 
  // Explicitly release memory
  // http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/ByteArray.html#clear()
- _fragment.data.bytes.clear();
- _fragment.data.bytes = null;
+ if (_fragment.data.bytes) {
+ _fragment.data.bytes.clear();
+ _fragment.data.bytes = null;
+ }
  }
  }