kolla-build tool failes to create rhel based containers - TypeError: argument of type 'NoneType' is not iterable

[Shyam]

Latest kolla-build tool from master repository[https://github.com/openstack/kolla] fails when user tries to build containers with --base rhel. Without base option it works well.

Here is stack trace:
[root@rhosp13-shyam-dev trilio-horizon-plugin]# python /home/stack/kolla/tools/build.py --base rhel horizon
INFO:kolla.common.utils:Found the docker image folder at /home/stack/kolla/docker
Traceback (most recent call last):
  File "/home/stack/kolla/tools/build.py", line 40, in <module>
    sys.exit(main())
  File "/home/stack/kolla/tools/build.py", line 30, in main
    statuses = build.run_build()
  File "/home/stack/kolla/kolla/image/build.py", line 1292, in run_build
    queue = kolla.build_queue(push_queue)
  File "/home/stack/kolla/kolla/image/build.py", line 1223, in build_queue
    self.filter_images()
  File "/home/stack/kolla/kolla/image/build.py", line 985, in filter_images
    if image.name in skipped_images:
TypeError: argument of type 'NoneType' is not iterable

[root@rhosp13-shyam-dev trilio-horizon-plugin]# cd /home/stack/kolla
[root@rhosp13-shyam-dev kolla]# git remote -v
origin https://github.com/openstack/kolla (fetch)
origin https://github.com/openstack/kolla (push)
[root@rhosp13-shyam-dev kolla]# git branch
* master

[Martin André (mandre)]

Likely fixed with https://review.openstack.org/#/c/588518/. I can't reproduce with master, http://paste.openstack.org/show/729380/.

[Shyam (shyam.biradar)]

After pulling this commit: https://review.openstack.org/#/c/588518/, issue got solved.

[Shyam (shyam.biradar)]

Fix was already committed. After getting latest pull, issue got solved. commit: https://review.openstack.org/#/c/588518/