openconnect: T4616: bugfix KeyError: 'local_users'

To reproduce:
  set vpn openconnect authentication mode local
  commit

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/vpn_openconnect.py", line 147, in <module>
    verify(c)
  File "/usr/libexec/vyos/conf_mode/vpn_openconnect.py", line 64, in verify
    if not ocserv["authentication"]["local_users"] or not ocserv["authentication"]["local_users"]["username"]:
KeyError: 'local_users'

1 files changed, 3 insertions, 3 deletions

diff --git a/src/conf_mode/vpn_openconnect.py b/src/conf_mode/vpn_openconnect.py
index 00b96884b..f24d5b618 100755
--- a/src/conf_mode/vpn_openconnect.py
+++ b/src/conf_mode/vpn_openconnect.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2018-2020 VyOS maintainers and contributors
+# Copyright (C) 2018-2022 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -61,8 +61,8 @@ def verify(ocserv):
     if "authentication" in ocserv:
         if "mode" in ocserv["authentication"]:
             if "local" in ocserv["authentication"]["mode"]:
-                if not ocserv["authentication"]["local_users"] or not ocserv["authentication"]["local_users"]["username"]:
-                    raise ConfigError('openconnect mode local required at leat one user')
+                if 'local_users' not in ocserv["authentication"] or 'username' not in ocserv["authentication"]["local_users"]:
+                    raise ConfigError('openconnect mode local requires at leat one user')
                 else:
                     for user in ocserv["authentication"]["local_users"]["username"]:
                         if not "password" in ocserv["authentication"]["local_users"]["username"][user]: