Don't add +/- comments when both are zero

[skearnes]

This is confusing since they will be followed up with a more useful comment after the automated update commit. (See open-reaction-database/ord-data#12.)

[connorcoley]

Are there ever cases where the change is actually +/- 0 reactions? For example, PRs that just correct an existing entry. Or are these reported as +1/-1?

[skearnes]

There could be (they would be 0/0 and not 1/1), but I think it's more confusing to have the 0/0 comments. I suppose we could do something like only post the comment if process_dataset is running on something in the data/ folder...WDYT?

[connorcoley]

I think that check would be preferable, since we'll want to keep the real 0/0 comments