BUG #6459: logging_collector=off but log_filename set inhibits logoutpu

The following bug has been logged on the website:

Bug reference:      6459
Logged by:          Christoph Anton Mitterer
Email address:      calestyo@scientia.net
PostgreSQL version: 9.1.1
Operating system:   All
Description:=20=20=20=20=20=20=20=20

Hi.

http://www.postgresql.org/docs/9.1/static/runtime-config-logging.html
claims that log_filename is only used when logging_collector is enabled.

However it seems that if the later is off, but the former is set (to
anything), no log output goes to stderr as well.

Cheers,
Chris.