NullPointerException crash in LottieComposition.getLayers()

[chinalwb]

Describe the bug
Race condition caused NPE.

See the exception stack below:

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.airbnb.lottie.LottieComposition.getLayers()' on a null object reference
       at com.airbnb.lottie.LottieDrawable.buildCompositionLayer(LottieDrawable.java:298)
       at com.airbnb.lottie.LottieDrawable.setComposition(LottieDrawable.java:216)
       at com.airbnb.lottie.LottieAnimationView.setComposition(LottieAnimationView.java:504)
       at com.airbnb.lottie.LottieAnimationView$2.onResult(LottieAnimationView.java:81)
       at com.airbnb.lottie.LottieAnimationView$2.onResult(LottieAnimationView.java:79)
       at com.airbnb.lottie.LottieTask.notifySuccessListeners(LottieTask.java:144)
       at com.airbnb.lottie.LottieTask.access$100(LottieTask.java:27)
       at com.airbnb.lottie.LottieTask$1.run(LottieTask.java:131)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:246)
       at android.app.ActivityThread.main(ActivityThread.java:8595)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

This is a race condition issue so not always reproducible.

I was using version 3.4.1, but I checked the code in master branch, the key part to this issue keeps the same between version 3.4.1 and the latest version 4.2.2.

Steps To Reproduce
Race condition issue, there is no fix steps to reproduce.

See the issue analysis in PR #1959 .

[WilbertClark]

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