I'm not asking about deleting the blank pages automatically; I must check myself if the pages are blank before deleting.
The answer is under Preflight -> Fixups. Click Options and select Create new Fixup. Look for Remove empty pages fixup and save it as you wish for easier search later.
Remember that it will delete only those pages that contain no objects at all. If you have white objects or objects without color at all, these pages are not empty and will not be deleted. If you want to delete these pages also, first create a fixup that will delete all empty objects.