ZF-12338: Zend_Filter_StripTags should return null if applied to a null value

Description

In Zend_Filter_StripTags, if the filter is applied to a null value empty string is returned.


    /**
     * Defined by Zend_Filter_Interface
     *
     * @todo improve docblock descriptions
     *
     * @param  string $value
     * @return string
     */
    public function filter($value)
    {
        if (is_null($value)) {
            return $value;
        }
        $value = (string)$value;

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