Backport of csi: prevent panic on volume delete into release/1.4.x #18242
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Backport
This PR is auto-generated from #18234 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
When a CSI volume is deleted when its plugin is not running, the function
volAndPluginLookup
returns anil
plugin value resulting a panic in the request handler.Note to reviewers: the other place where
volAndPluginLookup
is used already checks for anil
plugin.nomad/nomad/csi_endpoint.go
Lines 513 to 518 in e21ab7d