Merge pull request #251 from dBucik/fix_aup_stricttypes

fix: 🐛 Fix default value in ForceAup due to strictypes

Author: Dominik František Bučík

lib/Auth/Process/ForceAup.php

@@ -323,6 +323,9 @@ private function mergeAupsToBeApproved(array $perunAupsToBeApproved, array $voAu
      */
     private function parseDateTime(string $date, DateTime $default = null): DateTime
     {
+        if (null === $default) {
+            $default = DateTime::createFromFormat(self::DATETIME_FORMAT, '1970-01-01');
+        }
         $result = DateTime::createFromFormat(self::DATETIME_FORMAT, $date);
         if (false === $result) {
             $result = $default;