pyrocms/pyrocms — pull request #1198 by canton7 (2012-03-06 21:07:19+00:00)
Title: Trivial fix: Fix broken string interpolation in exception message

This is a trivial fix.

The exception thrown when a validation callback was not found included the
name of the nonexistent callback. However, the variable was used inside
single quotes, and therefore did not interpolate correctly.