Werk #7423: mk_postgres: fix syntax error

Version 1.5.0p17 and 1.5.0p18 of the mk_postgres plugin gave a syntax error when parsing databases. This results in empty output between [databases_start] and [databases_end] in the plugin output. As a consequence the checks postgres_stats, postgres_bloat, postgres_connections, postgres_locks and postgres_query_duration become stale.

To resolve the error the fixed version of mk_postgres has to be deployed to the affected hosts.

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