Fix assertion if index is dropped during REFRESH CONCURRENTLY

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: a45c950ae35e53de4007c9dd0991d5005a4bee7b
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-02-05T09:03:43Z
Releases: 14.11
Fix assertion if index is dropped during REFRESH CONCURRENTLY

When assertions are disabled, the built SQL statement is invalid and
you get a "syntax error". So this isn't a serious problem, but let's
avoid the assertion failure.

Backpatch to all supported versions.

Reviewed-by: Noah Misch

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