Fix assertion if index is dropped during REFRESH CONCURRENTLY

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: b73d216489e1ee480b19d6ad31b784ea33c352f3
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-02-05T09:04:10Z
Releases: 13.14
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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