Can't set a blank password
I recently installed Yosemite on a partition on my hard drive and for some reason it will not allow me to set a blank password for user/admin accounts. I installed Yosemite on a partition about a week ago (deleted that partition and reinstalled on a new partition last night) and it allowed me to do so without trouble but now when I try to leave the "new password" field blank it says that a new password is required. Any help is appreciated and thanks in advance!
MacBook Pro (13-inch Late 2011), OS X Yosemite (10.10.4), null