It's a best practice to use partitions, even if it's one and it spans the entire disk. There are tools out there that use that detail as part of their interrogation heuristics. I've also seen udev behave funny sometimes with partitionless drives. There's really no drawback to using partitions, no speed hit, nothing negative. It doesn't affect LVM at all as it's reading the disk and searching for metadata.

So you can swim upstream... or you can create a single partition. If you're that determined to make this work then I suggest that you get acquainted with the installer sources.