unknown-horizons/unknown-horizons — pull request #2115 by sabbott1877 (2013-05-30 00:23:54+00:00)
Title: Check message log before posting message

Fixes #2111 "Closing the logbook creates a notification message for
finished objectives." _message_log contains previously displayed
messages so check that list before displaying.

Update to comments to match style per feedback from pull request.