Merge "android_media_MediaSync: Do not pass NULL to AString ctor." into nyc-dev am: c4e8471ba4
am: 8a53cc9e26

* commit '8a53cc9e267d88f013402ea246ca507c494ccea4':
  android_media_MediaSync: Do not pass NULL to AString ctor.

Change-Id: If80c04ca3a7a61ee774e0353eb69d1017a31ffdc