Empty suffix doesn't work with bdb? (noted by Ben Lentz <BLentz@channing-bete.com>) (ITS#2970)

[ando@sys-net.it]

Full_Name: Pierangelo Masarati
Version: Unknown (any?)
OS: Unknown
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (81.72.89.40)
Submitted by: ando


I reproduced it in HEAD code.