Build tested:
389-ds-base-1.3.6.1-20.el7_4.x86_64
slapi-nis-0.56.0-4.el7.x86_64

[1] To verify I configured slapi-nis plugin: 
# ldapadd -D "cn=Directory Manager" -w Secret123
dn: cn=NIS Server,cn=plugins,cn=config
objectClass: top
objectClass: nsSlapdPlugin
objectClass: extensibleObject
cn: NIS Server
nsslapd-pluginPath: /usr/lib64/dirsrv/plugins/nisserver-plugin.so
nsslapd-pluginInitfunc: nis_plugin_init
nsslapd-pluginType: postoperation
nsslapd-pluginEnabled: on
nsslapd-pluginDescription: NIS Server Plugin
nsslapd-pluginVendor: redhat.com
nsslapd-pluginVersion: 0.56 (betxn support available and enabled by default)
nsslapd-pluginId: nis-plugin
nis-tcp-wrappers-name: ypserv
nsslapd-pluginarg0: 541

dn: nis-domain=example.com+nis-map=groups,cn=NIS Server,cn=plugins,cn=config
objectClass: extensibleObject
objectClass: top
nis-domain: example.com
nis-map: groups
nis-base: ou=Groups, dc=example, dc=com
nis-filter: (objectClass=groupOfNames)
nis-key-format: %{cn}
nis-value-format: %merge(" ","%deref_f(\"member\",\"(objectclass=ipanisNetgroup)\",\"cn\")","(%link(\"%ifeq(\\\"hostCategory\\\",\\\"all\\\",\\\"\\\",\\\"%collect(\\\\\\\"%{externalHost}\\\\\\\",\\\\\\\"%deref(\\\\\\\\\\\\\\\"memberHost\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"fqdn\\\\\\\\\\\\\\\")\\\\\\\",\\\\\\\"%deref_r(\\\\\\\\\\\\\\\"member\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"fqdn\\\\\\\\\\\\\\\")\\\\\\\",\\\\\\\"%deref_r(\\\\\\\\\\\\\\\"memberHost\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"member\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"fqdn\\\\\\\\\\\\\\\")\\\\\\\")\\\")\",\"%ifeq(\\\"hostCategory\\\",\\\"all\\\",\\\"\\\",\\\"-\\\")\",\",\",\"%ifeq(\\\"userCategory\\\",\\\"all\\\",\\\"\\\",\\\"%collect(\\\\\\\"%deref(\\\\\\\\\\\\\\\"memberUser\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"uid\\\\\\\\\\\\\\\")\\\\\\\",\\\\\\\"%deref_r(\\\\\\\\\\\\\\\"member\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"uid\\\\\\\\\\\\\\\")\\\\\\\",\\\\\\\"%deref_r(\\\\\\\\\\\\\\\"memberUser\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"member\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"uid\\\\\\\\\\\\\\\")\\\\\\\")\\\")\",\"%ifeq(\\\"userCategory\\\",\\\"all\\\",\\\"\\\",\\\"-\\\")\"),%{nisDomainName:-})")

adding new entry "cn=NIS Server,cn=plugins,cn=config"

adding new entry "nis-domain=example.com+nis-map=groups,cn=NIS Server,cn=plugins,cn=config"

[2] Added test entries:

# ldapadd -D "cn=Directory Manager" -w Secret123
dn: cn=tuser,ou=People,dc=example,dc=com
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: organizationalPerson
objectClass: top
objectClass: person
cn: tuser
sn: tuser
uid: tuser
gidNumber: 2000
homeDirectory: /home/tuser
uidNumber: 2000

dn: cn=tgroup,ou=Groups,dc=example,dc=com
objectClass: groupofnames
objectClass: top
cn: tgroup
member:
member: cn=tuser,ou=People,dc=example,dc=com

adding new entry "cn=tuser,ou=People,dc=example,dc=com"

adding new entry "cn=tgroup,ou=Groups,dc=example,dc=com"


[3] Removed empty member attribute without server crashing:

# ldapmodify -D "cn=Directory Manager" -w Secret123
dn: cn=tgroup,ou=Groups,dc=example,dc=com
changetype: modify
replace: member
member: cn=tuser,ou=People,dc=example,dc=com

modifying entry "cn=tgroup,ou=Groups,dc=example,dc=com"

Marking as VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2932