Set username from the returned LDAP attributes.

app/views/auth.py

@@ -43,6 +43,7 @@ def login():
         if attributes is None:
             flash(messages.LOGIN_UNSUCCESSFUL_ERROR)
             return render_template("pages/login.html", form=form)
+        username = attributes["name"]
         user = AuthenticatedUser.query.filter_by(username=username).first()
         if not user:
             user = AuthenticatedUser(