Revert "Fix NPE for invalid target exception"

This reverts commit d4fda02dd5.

Change-Id: I73341dc41c7effaa3209107b4e85503b17e2c826

graphics/java/android/graphics/drawable/AnimatedVectorDrawable.java

@@ -852,8 +852,8 @@ public class AnimatedVectorDrawable extends Drawable implements Animatable2 {
                         (VectorDrawable.VectorDrawableState) target, startTime);
             } else {
                 // Should never get here
-                throw new UnsupportedOperationException("Target should be group, path or vector. " +
-                        target == null ? "Null target" : target.getClass() + " is not supported");
+                throw new UnsupportedOperationException("Target should be either VGroup, VPath, " +
+                        "or ConstantState, " + target.getClass() + " is not supported");
             }
         }