[BugFix]hostcfgd,mgmt interface IP cannot be deleted IF gw wasn't given during config.

scripts/hostcfgd

@@ -1587,19 +1587,36 @@ class MgmtIfaceCfg(object):
         """
         syslog.syslog(syslog.LOG_DEBUG, 'MgmtIfaceCfg: mgmt iface update')
 
-        # Restart management interface service when config was changed
-        if data != self.iface_config_data.get(key):
-            cfg = {key: data}
-            syslog.syslog(syslog.LOG_INFO, f'MgmtIfaceCfg: Set new interface '
-                                           f'config {cfg} for {iface}')
-            try:
-                run_cmd(['sudo', 'systemctl', 'restart', 'interfaces-config'], True, True)
-            except subprocess.CalledProcessError:
-                syslog.syslog(syslog.LOG_ERR, f'Failed to restart management '
-                              'interface services')
-                return
+        existing_data = self.iface_config_data.get(key)
 
+        # Check if data has changed
+        if data != existing_data:
+            syslog.syslog(syslog.LOG_INFO, f'MgmtIfaceCfg: Updating config for {iface} with {data}')
+            # Update the interface configuration
             self.iface_config_data[key] = data
+        elif not data:
+            # If new data is empty, remove the key if it exists
+            if key in self.iface_config_data:
+                self.iface_config_data.pop(key)
+                syslog.syslog(syslog.LOG_INFO, f'MgmtIfaceCfg: Removed config for {iface}')
+            else:
+                syslog.syslog(syslog.LOG_DEBUG, f'MgmtIfaceCfg: No existing config to remove for {iface}')
+                # No change; no need to restart services
+                return
+        else:
+            # Data hasn't changed; no need to proceed
+            syslog.syslog(syslog.LOG_DEBUG, f'MgmtIfaceCfg: No changes detected for {iface}')
+            return
+
+        # Restart services after configuration change
+        try:
+            syslog.syslog(syslog.LOG_INFO, f'MgmtIfaceCfg: Updated:{self.iface_config_data}')
+
+            run_cmd(['sudo', 'systemctl', 'restart', 'interfaces-config'], True, True)
+
+            syslog.syslog(syslog.LOG_INFO, 'MgmtIfaceCfg: Successfully restarted services')
+        except subprocess.CalledProcessError:
+            syslog.syslog(syslog.LOG_ERR, 'MgmtIfaceCfg: Failed to restart management interface services')
 
     def update_mgmt_vrf(self, data):
         """Handle update management VRF state