holidays on week days behave incorrectly

Hi Folks,

I am having issues when I have holidays on week days.
if I exclude weekends and have a holiday on Friday there is a bug

rangebreaks=[
    # NOTE: Below values are bound (not single values), ie. hide x to y
    dict(bounds=['sat', 'mon']),  # hide weekends, eg. hide sat to before mon
    dict(bounds=[18, 9], pattern='hour'),  # hide hours outside of 9.30am-4pm
    dict(values=["2021-04-02", "2021-12-25"]),  # hide holidays (Christmas and New Year's, etc)
]

(This error originated from the built-in JavaScript code that runs Dash apps. Click to see the full stack trace or open your browser's console.)
TypeError: Cannot read property 'val' of undefined

at u (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2417931)

at doAutoRange (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2420435)

at Object.r.doAutoRangeAndConstraints (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2400288)

at S (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2374022)

at Object.c.syncOrAsync (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2287218)

at http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2375512

at Object.c.syncOrAsync (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2287218)

at Object.r.plot (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2376077)

at Object.r.newPlot (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2370936)

at Object.r.react (http://127.0.0.1:8050/_dash-component-suites/dash_core_components/async-plotlyjs.v1_15_0m1611086576.js:2:2380532)

首先，在 Dash 应用中复现报告的 rangebreaks 配置，并在包含工作日节假日时检查浏览器控制台。从 async-plotlyjs bundle 的 doAutoRange 路径追踪该故障；当星期五的节假日能够在不出现 TypeError 的情况下隐藏，同时周末和小时排除仍然有效时，即表示完成。