ENGCOM-2740: Fix possible undefined index when caching config data #13649

 - Merge Pull Request #13649 from mimarcel/magento2:fix/undefined-index-when-caching-config-data
 - Merged commits:
   1. 208abdd

Author: magento-engcom-team

app/code/Magento/Config/App/Config/Type/System.php

@@ -245,7 +245,7 @@ private function cacheData(array $data)
         );
         $scopes = [];
         foreach (['websites', 'stores'] as $curScopeType) {
-            foreach ($data[$curScopeType] as $curScopeId => $curScopeData) {
+            foreach ($data[$curScopeType] ?? [] as $curScopeId => $curScopeData) {
                 $scopes[$curScopeType][$curScopeId] = 1;
                 $this->cache->save(
                     $this->serializer->serialize($curScopeData),