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

test/transform/resource/after-delombok/NullLibrary1.java

@@ -34,6 +34,9 @@ public class NullLibrary1 {
 	public NullLibrary1(final String foo) {
 		this.foo = foo;
 	}
+	/**
+	 * @return a clone of this object, except with this updated property (returns {@code this} if an identical value is passed).
+	 */
 	@org.eclipse.jdt.annotation.NonNull
 	@java.lang.SuppressWarnings("all")
 	public NullLibrary1 withFoo(final String foo) {