Prevent NPE when draw is called without bounds being set

Test: unit test inside AdaptiveIconDrawableTest.java

Change-Id: Ic3260ce9c6bae595c7eba7be1cd7ae249939a1cf

graphics/java/android/graphics/drawable/AdaptiveIconDrawable.java

@@ -304,6 +304,9 @@ public class AdaptiveIconDrawable extends Drawable implements Drawable.Callback
 
     @Override
     public void draw(Canvas canvas) {
+        if (mLayersBitmap == null) {
+            return;
+        }
         if (mLayersShader == null) {
             mCanvas.setBitmap(mLayersBitmap);
             for (int i = 0; i < mLayerState.N_CHILDREN; i++) {