Fix Issue #49612 (#50073)

* Fix Issue #49612

Signed-off-by: Anas Badaha <anasb@mellanox.com>

* Fix Pep8 failures

Signed-off-by: Anas Badaha <anasb@mellanox.com>

* Add validation for send empty group name

Signed-off-by: Anas Badaha <anasb@mellanox.com>

* Fix Error message

Signed-off-by: Anas Badaha <anasb@mellanox.com>

lib/ansible/modules/network/onyx/onyx_mlag_vip.py

@@ -145,11 +145,17 @@ class OnyxMLagVipModule(BaseOnyxModule):
         if req_mac:
             req_mac = req_mac.lower()
 
-        if req_group != current_group or req_ip != current_ip:
+        if req_ip is not None:
+            if req_group is None:
+                self._module.fail_json(msg='In order to configure Mlag-Vip you must send '
+                                           'group name param beside IPaddress')
             ipaddr, mask = req_ip.split('/')
-            self._commands.append(
-                'mlag-vip %s ip %s /%s force' % (req_group, ipaddr, mask))
-        if req_mac != current_mac:
+            if req_group != current_group or req_ip != current_ip:
+                self._commands.append('mlag-vip %s ip %s /%s force' % (req_group, ipaddr, mask))
+        elif req_group and req_group != current_group:
+            self._commands.append('mlag-vip %s' % req_group)
+
+        if req_mac and req_mac != current_mac:
             self._commands.append(
                 'mlag system-mac %s' % (req_mac))
         if self._commands:

test/units/modules/network/onyx/test_onyx_mlag_vip.py

@@ -65,6 +65,14 @@ class TestOnyxMlagVipModule(TestOnyxModule):
                     'mlag system-mac 00:00:5e:00:01:4e', 'no mlag shutdown']
         self.execute_module(changed=True, commands=commands)
 
+    def test_mlag_send_group_name_only_change(self):
+        self._mlag_enabled = False
+        set_module_args(dict(group_name='neo-mlag-vip-500',
+                             delay=0))
+        commands = ['mlag-vip neo-mlag-vip-500',
+                    'no mlag shutdown']
+        self.execute_module(changed=True, commands=commands)
+
     def test_mlag_absent_no_change(self):
         self._mlag_enabled = False
         set_module_args(dict(state='absent'))