Improve handling of rating asset for native ad view.
Improve handling of rating asset for native ad view.

palaniyappanBala/MobFox-Android-SDK,aiurlano/MobFox-Android-SDK,MaTriXy/MobFox-Android-SDK,palaniyappanBala/MobFox-Android-SDK,aiurlano/MobFox-Android-SDK,MeiCassieDong/test,MaTriXy/MobFox-Android-SDK,palaniyappanBala/MobFox-Android-SDK,MaTriXy/MobFox-Android-SDK,aiurlano/MobFox-Android-SDK