Finish wrapped launcher animations if impl is gone

If the runner impl is gone (since it is a weakreference), we
still need to complete the animation contract by calling the
finish callback, so do that.

Bug: 183993924
Test: atest ActivityMetricsLoggerTests
Change-Id: Idce1859f0417cb74bbb9884e0d06750539e4545e

quickstep/src/com/android/launcher3/WrappedLauncherAnimationRunner.java

@@ -58,6 +58,8 @@ public class WrappedLauncherAnimationRunner<R extends WrappedAnimationRunnerImpl
         if (animationRunnerImpl != null) {
             animationRunnerImpl.onCreateAnimation(transit, appTargets, wallpaperTargets,
                     nonAppTargets, result);
+        } else {
+            result.setAnimation(null, null);
         }
     }
 }