(ITS#5584) memberof and modify: replace with 0 new entries

Full_Name: Andrew Bartlett Version: CVS HEAD OS: Fedora 9 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (59.167.251.137)

The memberOf plugin asserts if I attempt a modify like:

(snippet from our python test script, using ldb, but I hope you get the idea)

ldb.modify_ldif(""" dn: cn=ldaptestgroup2,cn=users,""" + self.base_dn + """ changetype: modify replace: member """)

slapd: memberof.c:849: memberof_op_modify: Assertion `ml->sml_mod.sm_nvalues != ((void *)0)' failed.

I think this just needs to be handled like the delete case, which our tests already show pass correctly.