Resolve Deprecated Functionality: preg_split(): Passing null to param…

…eter #2 ($subject) while using PHP 8.0+

In new versions of PHP (8.*) the Second Parameter subject can't be null so if the $ranges is null then this will through exception : `Exception #0 (Exception): Deprecated Functionality: preg_split(): Passing null to parameter #2 ($subject).....`. That crash the code flow. So by this commit solved the problem.

Model/Config.php

@@ -176,7 +176,7 @@ public function isIpMatched($ip, array $ranges)
      */
     public function getAllowedRanges()
     {
-        $ranges = $this->scopeConfig->getValue(self::XML_PATH_GENERAL_AUTHORIZED_IPS);
+        $ranges = $this->scopeConfig->getValue(self::XML_PATH_GENERAL_AUTHORIZED_IPS) ?? "";
         return preg_split('/\s*[,;]+\s*/', $ranges);
     }