sampsyo/beets — pull request #36 by KraYmer (2012-05-08 21:46:01+00:00)
Title: Issue 358:Options for when lastgenre fails to find a tag

cf http://code.google.com/p/beets/issues/detail?id=358

Added 'fallback_str' plugin parameter to specify a fallback string when no genre found. Declare the parameter without specifying a value (= empty string) to blank the genre field when no genre found.