Preventing Blank Locations

Is anyone aware of a way to prevent users from being able to transfer inventory into a blank location?  If they leave the location blank on the inventory transfer screen, they get a warning that the location doesn't exist but it will create the location as a secondary location.  This is causing issues because we have to frequently search for inventory in blank locations to find out where it's supposed to be.

I understand that some companies use a blank as their primary but we never use a blank as the primary or secondary.

Thanks,