Rendering error if today is too far away from the tasks

[Klaus-Valse]

I was just investigating a problem with the week and month view mode, so I tried to get a minimal working example of the original Frappé Gantt to run.
Turns out if the tasks are too far away from the current date, there is a rendering problem.

If I change the date of the tasks to the same month as the current date, everything renders just fine.

The bug occurs in the main Gantt class in:

make_grid_highlights() {
    if (this.options.highlight_weekend) this.highlightWeekends()
    // highlight today's | week's | month's | year's
    if (
      this.view_is(VIEW_MODE.DAY) ||
      this.view_is(VIEW_MODE.WEEK) ||
      this.view_is(VIEW_MODE.MONTH) ||
      this.view_is(VIEW_MODE.YEAR)
    ) {
      // Used as we must find the _end_ of session if view is not Day
      const { x: left, date } = this.computeGridHighlightDimensions(this.options.view_mode)
      const top = this.options.header_height + this.options.padding / 2;
      const height = (this.options.bar_height + this.options.padding) * this.tasks.length;
      this.$current_highlight = this.create_el({ top, left, height, classes: 'current-highlight', append_to: this.$container })
      let $today = document.getElementById(date_utils.format(date).replaceAll(' ', '_'))  // <- $today ends up being null

      $today.classList.add('current-date-highlight')
      $today.style.top = +$today.style.top.slice(0, -2) - 4 + 'px'
      $today.style.left = +$today.style.left.slice(0, -2) - 8 + 'px'
    }
  }

[safwansamsudeen]

Fixed in #423, thank you!