What do the messages "Poster: No sessions found" imply? (4298415)

Event_log shows the following messages:
Notice 2009-12-09 10:25:12.316250 14769 7 Poster: No sessions found (posting from server_name, queue queue_name, to server_name) [module osp]

General information.

The messages Poster: No sessions found are related to the query Post runs when there is blocking situation to find which session is the blocking session and which one is the blocked. If the query returns a null value, then such messages are printed. It could be that such sessions are killed or exited. In these situations, the messages are only information messages and are not necessarily a harbinger for any error condition. If such messages are preceded or followed by other errors, then such errors may need to be looked into. Other than this, such messages can be ignored.