matiasdoyle/runkeeper-js — pull request #1 by qualbeen (2014-06-24 14:14:53+00:00)
Title: Support empty response when use of 'opt.modified_since'

Without this little line `client.activityFeed()` won't work if you use `opt.modified_since` together with `opt.get_next`.

I'm not sure if passing an empty array to the callback is best practice, but it works well enough.
I believe this case should not trow an error, since "304 Not Modified" is a valid response!