* Adds an alias to `noContent`, so that a `not` switch can work on `empty`.
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*
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* To remove once https://github.com/beberlei/assert/pull/272 has been merged and released.
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*
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* @method static bool allEmpty(mixed $value, string|callable $message = null, string $propertyPath = null) Assert that value is empty for all values.
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* @method static bool nullOrEmpty(mixed $value, string|callable $message = null, string $propertyPath = null) Assert that value is empty or that the value is null.