T5921: Fix OpenConnect verify for local users

Fix verify error for the VPN OpenConnect configuration with
local authentication and without any user

  File "/usr/libexec/vyos/conf_mode/vpn_openconnect.py", line 94, in verify
    if not ocserv["authentication"]["local_users"]:
KeyError: 'local_users'

1 files changed, 1 insertions, 1 deletions

diff --git a/src/conf_mode/vpn_openconnect.py b/src/conf_mode/vpn_openconnect.py
index 421ac6997..08e4fc6db 100755
--- a/src/conf_mode/vpn_openconnect.py
+++ b/src/conf_mode/vpn_openconnect.py
@@ -91,7 +91,7 @@ def verify(ocserv):
                 if not ocserv["authentication"]['radius']['server']:
                     raise ConfigError('Openconnect authentication mode radius requires at least one RADIUS server')
             if "local" in ocserv["authentication"]["mode"]:
-                if not ocserv["authentication"]["local_users"]:
+                if not ocserv.get("authentication", {}).get("local_users"):
                     raise ConfigError('openconnect mode local required at least one user')
                 if not ocserv["authentication"]["local_users"]["username"]:
                     raise ConfigError('openconnect mode local required at least one user')