Fix a bug when trying to authenticate with a non existing user

core/admin/mailu/internal/nginx.py

@@ -37,6 +37,7 @@ def handle_authentication(headers):
         password = urllib.parse.unquote(headers["Auth-Pass"])
         ip = urllib.parse.unquote(headers["Client-Ip"])
         user = models.User.query.get(user_email)
+        if user:
             for token in user.tokens:
                 if (token.check_password(password) and
                     (not token.ip or token.ip == ip)):
@@ -45,7 +46,7 @@ def handle_authentication(headers):
                             "Auth-Server": server,
                             "Auth-Port": port
                         }
-        if user and user.check_password(password):
+            if user.check_password(password):
                 return {
                     "Auth-Status": "OK",
                     "Auth-Server": server,