Ticket #47772 empty modify returns LDAP_INVALID_DN_SYNTAX
https://fedorahosted.org/389/ticket/47772
Reviewed by: tbordaz, mreynolds (Thanks!)
Branch: 389-ds-base-1.2.11
Fix Description: tbordaz pointed out a couple of other places where the
pblock modify_mods structure is being referenced directly, and needs to be
checked for NULL.
Platforms tested: RHEL6 x86_64
Flag Day: no
Doc impact: no
(cherry picked from commit 2d25bb4dd39d09d8b5fc5b69702d6e1cccc2c65f)
(cherry picked from commit ba5938bfa94d906c2189ebc6579057b2779ee68d)
(cherry picked from commit 1f3d9f685f2adbb4dc0ebcec3def4ecf68a87013)