fix psalm

Author: jturbide

src/Mvc/Controller/Traits/Query/Conditions/FilterConditions.php

@@ -69,7 +69,7 @@ public function defaultFilterCondition(?array $filters = null, ?array $allowedFi
         }
 
         $allowedFilters ??= $this->getFilterFields()?->toArray();
-        $flattenAllowedFilters = FlattenKeys::process($allowedFilters);
+        $flattenAllowedFilters = FlattenKeys::process($allowedFilters ?? []);
 
         $query = [];
         $bind = [];

src/Mvc/Controller/Traits/Query/Conditions/SearchConditions.php

@@ -116,7 +116,7 @@ public function generateSearchSubQuery(string $searchTerm, array $searchFields,
     {
         $subQuery = [];
 
-        $flattenSearchFields = FlattenKeys::process($searchFields);
+        $flattenSearchFields = FlattenKeys::process($searchFields) ?? [];
         foreach ($flattenSearchFields as $searchField => $enabled) {
             if (!$enabled) {
                 continue;