Fix NPE in ScreenCapture.release method.

Bug: 276941014
Test: Manual test

Change-Id: I3675d8d3479ae0f514f0e113ddbf23e85b13e936

core/java/android/window/ScreenCapture.java

@@ -309,7 +309,7 @@ public class ScreenCapture {
 
         /** Release any layers if set using {@link Builder#setExcludeLayers(SurfaceControl[])}. */
         public void release() {
-            if (mExcludeLayers.length == 0) {
+            if (mExcludeLayers == null || mExcludeLayers.length == 0) {
                 return;
             }