waterfall missing values are not respected

I would expect this to render to https://rreusser.github.io/plotly-mock-viewer/#waterfall_profit-loss_2018_positive-negative, but it currently doesn't

y <- c("Sales", "Consulting", "Maintenance", "Other revenue", "Net revenue", "Purchases", "Material expenses", "Personnel expenses", "Other expenses", "Operating profit", "Investment income", "Financial income", "Profit before tax", "Income tax (15%)", "Profit after tax")
  
  d <- data.frame(
    measure = c("relative", "relative", "relative", "relative", "total", "relative", "relative", "relative", "relative", "total", "relative", "relative", "total", "relative", "total"),
    y = factor(y, levels = y),
    x = c(375, 128, 78, 27, NA, -327, -12, -78, -12, NA, 32, 89, NA, -45, NA)
  )
  
plot_ly(d, measure = ~measure, y = ~y, x = ~x) %>%
    add_trace(type = "waterfall", orientation = "h") %>%
    layout(yaxis = list(autorange = "reversed"))

plot_ly を使用して issue の横向き waterfall の例を再現し、add_trace(type = "waterfall", orientation = "h") と layout を追加します。期待される plotly-mock-viewer の結果と比較し、その後、R binding が NA 値と waterfall の measure をどのように渡しているかを追跡します。提供された例が欠損値を期待どおりにレンダリングすれば完了です。