Comment 8 for bug 1961448

Reviewed: https://review.opendev.org/c/openstack/charm-hacluster/+/836887
Committed: https://opendev.org/openstack/charm-hacluster/commit/d54de3d3464352ca07e4b9d9f6a5c8350464b29b
Submitter: "Zuul (22348)"
Branch: master

commit d54de3d3464352ca07e4b9d9f6a5c8350464b29b
Author: Rodrigo Barbieri <email address hidden>
Date: Wed Apr 6 18:42:13 2022 -0300

    Prevent errors when private-address=None

    Whenever a peer returns None as its IP, it results in
    misconfiguration in corosync.conf, which results in
    a series of cascading hook errors that are difficult to
    sort out.

    More specifically, this usually happens when network-get
    does not work for the current binding. The main problem
    is that when changing bindings, a hook fires before the
    network-get data is updated. This hook fails and prevents
    the network-get from being re-read.

    This patch changes the code behavior to ignore None IP
    entries, therefore gracefully exiting and deferring further
    configuration due to insufficient number of peers when that
    happens, so that a later hook can successfully read the IP
    from the relation and set the IPs correctly in corosync.

    Closes-bug: #1961448
    Change-Id: I5ed140a17e184fcf6954d0f66e25f74564bd281c