Fix error from previous PR that changed casting scores

[AndrewYinLi]

This PR is intended to fix an error my previous PR created. I didn't account for home_score and away_score being an int already because the code from before #128 casted the two variables as int. When isdigit() is called on an int, an error is thrown, so I added changes to check whether home_score and away_score are str objects before calling isdigit().

[AndrewYinLi]

Also the codeclimate issues are trivial and aren't worth making a new function for.