Peer discovery cleanup: be more defensive (backport #12809) #12811
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See discussion #12807 for details. rabbit_peer_discovery:normalize/1 can be changed to only return lists of nodes but then there is a number of core code paths that treat a single node as a special "preselected" value. So let's keep that part and convert both sets of nodes to lists before computing the difference. (cherry picked from commit 55411e6)
(cherry picked from commit d3a3ace)
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See discussion #12807 for details. This is to avoid an exception when
the cleanup functions perform peer discovery and may get a single node back
instead of a list.
rabbit_peer_discovery:normalize/1can bechanged to only return lists of nodes but then
there is a number of core code paths that
treat a single node as a special "preselected" value.
So let's keep that part and convert both
sets of nodes to lists before computing the
difference.
This is an automatic backport of pull request #12809 done by [Mergify](https://mergify.com).