Fix assertion if index is dropped during REFRESH CONCURRENTLY

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: fb3836855ca12024f3d7432a4a04217073b1688c
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-02-05T09:03:03Z
Releases: 16.2
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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