fix dumb issue where additional full credit tier callback was flummoxing wholesale rubric-copy
fix dumb issue where additional full credit tier callback was flummoxing wholesale rubric-copy

mkoon/gradecraft-development,UM-USElab/gradecraft-development,peterkshultz/gradecraft-development,mkoon/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,peterkshultz/gradecraft-development,mkoon/gradecraft-development,UM-USElab/gradecraft-development,peterkshultz/gradecraft-development