Fixes Bug 1072540 - Look Ma! No pipe dump!

the TransformRule version of the stackwalker invocation without producing or needing a pipe dump!  
I get what the code does, but why this? Why would the method even be called if it doesn't have the right name?
Also, should it not be appropriate to use a `self.config.logger.warning` here?

Perhaps I'm totally out of context but what if there are more names that don't start with the same prefix?