DT 0.24

• Fixed a bug with missing numeric values rendered as 0 (thanks, @tverbeke, #1000).

• Box scalar elements of 'list' columns so that, e.g., data.frame(col = I(integer(), 1, 2:3)) is represented in JavaScript as [[], [1], [2, 3]] instead of [[], 1, [2, 3]] (thanks, @mtmorgan, #1005).