[fixes #2682] Fix NPE, always add Javadoc return statement

test/transform/resource/after-ecj/WithNested.java

@@ -1,6 +1,9 @@
 public interface WithNested<Z> {
   @lombok.RequiredArgsConstructor class IAmStaticReally {
     final @lombok.With String x;
+    /**
+     * @return a clone of this object, except with this updated property (returns {@code this} if an identical value is passed).
+     */
     public @java.lang.SuppressWarnings("all") WithNested.IAmStaticReally withX(final String x) {
       return ((this.x == x) ? this : new WithNested.IAmStaticReally(x));
     }