shoes/shoes4 — pull request #767 by Suirtimed (2014-06-18 15:27:08+00:00)
Title: Fix a couple of fatal exceptions caused by bad input

I pulled the project down and found that a couple of bad behaviors like just pressing the equals button caused the program to exit with a type conversion exception. I put a simple validation in to ensure that the program continued to run in these cases. I didn't see how/where to write tests for this sample otherwise I would have.