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Have unrated downloads read "No ratings" under the ratings column instead of "0.0"

Fairly self-explanatory. Makes things look much less harsh on the download page, plus this might actually encourage people to leave reviews on less popular downloads.

Also, I've noticed that people don't tend to leave reviews on anything outside of the SMW sections, so it might be worth lifting the comment requirement in those sections entirely and instead just require users to be signed in in order to rate submissions.
Definitely agree with the first idea, I'll go add it in a bit. Not too sure about the second one, however - ratings originally didn't require comments and it led to a lot of nonsensical 0-star ratings for no obvious reasons. I think it'd be a better idea to leave the comment requirement intact.
"I'll go add it in a bit", more like "I'll go forget about it for a bit". Anyhow, a rating of 0 now displays as "No rating" on the details page and "None" on the list page.