Wrap lazy composition tasks with a null check

lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java

diff --git a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
index a274ab3..d846b69 100644
--- a/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
+++ b/lottie/src/main/java/com/airbnb/lottie/LottieDrawable.java
@@ -226,7 +226,11 @@
     Iterator<LazyCompositionTask> it = new ArrayList<>(lazyCompositionTasks).iterator();
     while (it.hasNext()) {
       LazyCompositionTask t = it.next();
-      t.run(composition);
+      // The task should never be null but it appears to happen in rare cases. Maybe it's an oem-specific or ART bug.
+      // https://github.com/airbnb/lottie-android/issues/1702
+      if (t != null) {
+        t.run(composition);
+      }
       it.remove();
     }
     lazyCompositionTasks.clear();