title: Fill one column from a list based on the value of another column
body: <p><br>
  I have a sheet where one column has values either <code>"delete"</code> or <code>empty</code>. If it is delete, I need to fill another column randomly from one of these value: <code>{"test1", "test2", "test3"}</code>. If it is empty, leave empty. How can this be done?</p>