This solves the following error:
`An error occurred during processing; checking has been aborted. The error message was: "count(): Parameter must be an array or an object that implements Countable" at /home/travis/build/WordPress-Coding-Standards/WordPress-Coding-Standards/WordPress/Sniffs/WP/I18nSniff.php:233`
`array_shift()` returns null if the array is empty or not an array which may have happened when less arguments where passed to the i18n function then expected.
In that case `$tokens` will be null and start throwing the `countable` error for PHP nightly.
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