fixed issue when config is empty

Author: magefan

Model/Config.php

@@ -124,6 +124,8 @@ public function getBlocksInfo(): array
 
                 $this->blocks[$blockData['block_identifier']] = $blockData['first_images_to_skip'];
             }
+            
+            $this->blocks = null !== $this->blocks ?: [];
         }
 
         return $this->blocks;