title: Checking if a collection is null or empty in Groovy
body: <p>I need to perform a null or empty check on a collection; I think that <code>!members?.empty</code> is incorrect.  Is there a groovier way to write the following?</p>
  <pre><code>if (members &amp;&amp; !members.empty) {
      // Some Work
  }
  </code></pre>