[BUGFIX 0169963] (ARDiscovery) (Android) Prevent potential crash in ReceiveJsonCallback.
[BUGFIX 0169963] (ARDiscovery) (Android) Prevent potential crash in ReceiveJsonCallback.

Change-Id: Id9fdb84c8783ff055ac3422197f9a7fafd3222a6

Parrot-Developers/ARSDKBuildUtils,aoi/ARSDKBuildUtils,cvramire/ARSDKBuildUtils,cvramire/ARSDKBuildUtils,Parrot-Developers/ARSDKBuildUtils,aoi/ARSDKBuildUtils