@bradymiller: php 8.2 fix - date is being flagged as not valid even if valid (#197)

Author: bradymiller

src/Rule/Datetime.php

@@ -92,7 +92,8 @@ protected function checkDate($dateTime, $format, $value)
     {
         $equal = (string) $dateTime->format($format) === (string) $value;
 
-        if ($dateTime->getLastErrors()['warning_count'] === 0 && $equal) {
+        $warningCount = $dateTime->getLastErrors()['warning_count'] ?? 0;
+        if ($warningCount === 0 && $equal) {
             return $dateTime;
         }
         return false;