Commit ab6ed65d authored by David Garcia Watkins's avatar David Garcia Watkins Committed by Dimitris Mitsis

Fix fatal error with PHP 5.6

PHP Fatal error: Cannot use isset() on the result of an expression (you can use 'null !== expression' instead)

https://onthegosystems.myjetbrains.com/youtrack/issue/wpmlwpseo-67
parent 1723ac7f
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