bugfix : fix user_entry validation control (#1871)

* fix user_entry control

* code optimsation

* poetry syntaxe requirement

* poetry is really strict with python

* resolve linting error

* Update security.py

* fix user_entry = [()]

Co-authored-by: Hayden <64056131+hay-kot@users.noreply.github.com>

mealie/core/security/security.py

@@ -86,7 +86,7 @@ def user_from_ldap(db: AllRepositories, username: str, password: str) -> Private
         f"(&(objectClass=user)(|(cn={username})(sAMAccountName={username})(mail={username})))",
         ["name", "mail"],
     )
-    if not user_entry:
+    if user_entry is not None and len(user_entry[0]) != 0 and user_entry[0][0] is not None:
         user_dn, user_attr = user_entry[0]
     else:
         return False