Why is isFulfilledData and isWhitespaceData checking if open is defined? (instead of only value)

[mozeryansky]

Is whitespace only when value is not defined?

From here: https://github.com/tradingview/lightweight-charts/blob/master/src/model/data-consumer.ts#L188

I had the issue where I was passing my full candles just without value, but the chart was crashing since open was present and it was hitting an assert later on.