Hierarchy limited style not PHP 5.4 compatible

Problem/Motivation

class EntityCollectionStyleHierarchyLimited method build() is using an arbitrary expression which was introduced in PHP 5.5. Therefore the plugin lacks PHP 5.4 support.

if ( !empty($limitation = $this->getLimits()) ) {}

I know that PHP 5.4 is for long time EOL, but I think for Drupal 7 modules it needs to be considered till it's own end of life, as there are too much running PHP 5.4 environments in the world.

Proposed resolution

Save the result in the variable first and and then process the empty check.