title: is there isEmpty in Guava?
body: <p>Is there any equivalent in google Guava for <a href="http://commons.apache.org/proper/commons-collections//apidocs/org/apache/commons/collections/CollectionUtils.html#isEmpty%28java.util.Collection%29" rel="nofollow">apache commons' <code>CollectionUtils.isEmpty(list)</code></a> to check if a collection is null or empty?</p>