Fix: Fixed accessing attribute of undefined object.

lib/mentat/__init__.py

@@ -20,4 +20,4 @@ open-source project.
 
 __author__  = "Jan Mach <jan.mach@cesnet.cz>"
 __credits__ = "Pavel Kácha <pavel.kacha@cesnet.cz>, Andrea Kropáčová <andrea.kropacova@cesnet.cz>"
-__version__ = "2.7.8"
+__version__ = "2.7.9"

lib/vial/view/__init__.py

@@ -638,6 +638,13 @@ class BaseLoginView(SimpleView):
                 )
                 self.abort(500)
 
+            if not user:
+                self.flash(
+                    gettext('You have entered wrong login credentials.'),
+                    vial.const.FLASH_FAILURE
+                )
+                self.abort(403)
+
             if not user.enabled:
                 self.flash(
                     flask.Markup(gettext(