Comment 4 for bug 1784536

Reviewed: https://review.openstack.org/587368
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=3831fe785774a4385086c2a3c3a8eb5252bbe5b4
Submitter: Zuul
Branch: master

commit 3831fe785774a4385086c2a3c3a8eb5252bbe5b4
Author: biwei <kkttaa678@163.com>
Date: Tue Jul 31 05:43:01 2018 -0400

    Expose a bug that issue token with project-scope gets error

    When sets project-scoped with project ID key but the value is a
    domain id, it retures 400 BadRequest: "object of type 'NoneType'
    has no len()".
    The expected code should be 404 project not found internal and
    401 to end user.

    This patch exposes this bug and it will be fixed in the following patch.

    Partial-bug: #1784536
    Change-Id: I67983bdd300452a5bff947ca3bcfb77a0e6b4574