[check_postgres] Patch to fix an issue with slony_status report when one uses a service to connect

[Guillaume Lelarge]

Hi,

I had the "Use of uninitialized value in concatenation (.) or string at
./check_postgres.pl" error message on a customer's server when using the
slony_status report.

Once again, it happens only when you use --dbservice option. When
someone use this option, $db->{dbname} is not initialized. (I said "Once
again" because we already had the issue with the vacuum/analyze report.
My patch is a modified copy of the one I sent for the vacuum/analyze
report issue.)

The patch attached fixes it.

Regards.


-- 
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com
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