Handle missing index/message on permalink page properly. (6.1
)
#21706
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Note: This is a backport of #21663 to
6.1
.Description
Motivation and Context
Prior to this PR, the message permalink page was just showing a spinner when the referenced index was missing. This PR is fixing this by catching 404s and show a helpful message explaining the most probable cause.
Fixes #21653.
How Has This Been Tested?
Screenshots (if appropriate):
Before:

After:

Types of changes
Checklist: