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@trigger_error('The '.__NAMESPACE__.'\NullValidator class is deprecated since version 2.7 and will be removed in 3.0. Use the IsNullValidator class in the same namespace instead.', E_USER_DEPRECATED);
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @deprecated since version 2.7, to be removed in 3.0. Use IsNullValidator instead.