Fix warning in PHP 7.2 #2
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This fixes a warning in PHP 7.2 from doing `count(null)`: > PHP Warning – yii\base\ErrorException > > count(): Parameter must be an array or an object that implements Countable > 1. in /vendor/yiidoc/yii2-selectize/Selectize.php at line 84
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This fixes a warning in PHP 7.2 from doing
count(null):