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b3eb6680ef
A user who somehow got an empty `zulip` database, but without a
`zerver_messages` table in it, would get stuck in the installer at:
```
++ su postgres -c 'cd / && psql -v ON_ERROR_STOP=1 -Atc '\''SELECT COUNT(*) FROM zulip.zerver_message;'\'' zulip'
ERROR: relation "zulip.zerver_message" does not exist
LINE 1: SELECT COUNT(*) FROM zulip.zerver_message;
^
+ records=
```
Treat a failure to select from `zerver_messages` as having 0 messages,
and continue with the `DROP DATABASE IF EXISTS` / `CREATE DATABASE`
that `create-db.sql` usually does.
Fixes: #29110.
(cherry picked from commit ed70b62ea8)