stepmania/stepmania — pull request #323 by kyzentun (2014-10-01 23:15:52+00:00)
Title: Preserve Steps of unknown Style.

This is partially a fix for #320, and partially protection against the possible future problem of new styles being added. With this, a Steps that has an unrecognized style should pass through StepMania unharmed. Steps of unknown Style are of course not editable or playable, or visible to the theme in any way, though a warning is printed to the log file on song loading.