[FIX] auth_ldap: return false on LDAPError

Author: robinkeunen

addons/auth_ldap/users_ldap.py

@@ -129,6 +129,7 @@ def authenticate(self, conf, login, password):
             return False
         except ldap.LDAPError:
             _logger.exception('An LDAP exception occurred')
+            return False
         finally:
             conn.unbind()