Turn bugs

[Closes https://github.com/gschorkopf/frolfr/issues/69]
It felt a bit more right. I don't think of it as "0 shots were taken" but "no shots were taken", or "there is no score".

Additionally, on the backend I have a validation that the score is between 1 and 8, or nil. If we ran our JS saveAll() function, we'd get an error.