message: Query Browser: Remove null value entries from the tooltip
  The tooltip was showing series with null values as "0" for line graphs.
  These series should probably not be shown in the tooltip at all, which
  matches the behavior for stack graphs.
diff: @@ -176,14 +176,18 @@ const Tooltip_: React.FC<TooltipProps> = ({ activePoints, center, height, style,
  const isOnLeft = x > (width - 40) / 2;
  const allSeries = activePoints
  - .map((point, i) => ({
  + .flatMap((point, i) =>
  + point.y === null
  + ? []
  + : [
  + {
  color: style[i]?.fill,
  name: style[i]?.name,
  total: point._y1 ?? point.y,
  value: valueFormatter(style[i]?.units)(point.y),
  - }))
  - // For stacked graphs, this filters out data series that have no data for this timestamp
  - .filter(({ value }) => value !== null)
  + },
  + ],
  + )
  .sort((a, b) => b.total - a.total)
  .slice(0, TOOLTIP_MAX_ENTRIES);
  