list index out of range in cluster_ready

[Jason Hobbs]

This is a new issue we're seeing in the master branch of charm-percona-cluster:

http://paste.ubuntu.com/p/bnBsHCbfJv/

Bundle and overlay: http://paste.ubuntu.com/p/3rXqBr4Yvg/

[Ryan Beisner (1chb1n)]

https://github.com/openstack/charm-percona-cluster/commit/055d2bb17fc7fc4025842eaf6444417643d3937a

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/576253

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/576253
Committed: https://git.openstack.org/cgit/openstack/charm-percona-cluster/commit/?id=1c4d99123235d9f4334a05988982d0dac54ebbd3
Submitter: Zuul
Branch: master

commit 1c4d99123235d9f4334a05988982d0dac54ebbd3
Author: David Ames <email address hidden>
Date: Mon Jun 18 13:20:16 2018 -0700

    Do not use relation_ids directly

    Use a for loop to handle relation_ids for the case when the
    relationship has not yet been created.

    Change-Id: Ia9cf980591a1bf707f3a1a009229c5f5c222206f
    Closes-Bug: #1777508

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/18.05
Review: https://review.openstack.org/577717

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/577717
Committed: https://git.openstack.org/cgit/openstack/charm-percona-cluster/commit/?id=fb2757611abe92612d840b80b5fa8fbab0afba08
Submitter: Zuul
Branch: stable/18.05

commit fb2757611abe92612d840b80b5fa8fbab0afba08
Author: David Ames <email address hidden>
Date: Mon Jun 18 13:20:16 2018 -0700

    Do not use relation_ids directly

    Use a for loop to handle relation_ids for the case when the
    relationship has not yet been created.

    Change-Id: Ia9cf980591a1bf707f3a1a009229c5f5c222206f
    Closes-Bug: #1777508
    (cherry picked from commit 1c4d99123235d9f4334a05988982d0dac54ebbd3)