VictoryScatter doesn't render points when all z values are the same

[richardbutler]

When all points have the same z (bubbleProperty, or whatever) value, then the svg paths get given NaNs. It appears this is due to a division by zero because the breadth of the z domain is zero.

Just editing the example from the docs, you can observe this behaviour:

<VictoryChart
  theme={VictoryTheme.material}
  domain={{ x: [0, 5], y: [0, 7] }}
>
  <VictoryScatter
    style={{ data: { fill: "#c43a31" } }}
    size={7}
    bubbleProperty="z"
    data={[
      { x: 1, y: 2, z: 3 }, // Change this z to 4 and it renders
      { x: 2, y: 3, z: 3 },
      { x: 3, y: 5, z: 3 },
      { x: 4, y: 4, z: 3 },
      { x: 5, y: 7, z: 3 }
    ]}
  />
</VictoryChart>

I don't know the best course of action for this - whether to use the minBubbleSize for these points, or pick the average of the min and maxBubbleSize.

Thoughts?