Voronoi clipCells() end[1] null Example III

an example to reproduce the Cannot read property '0' of null in clipCells() error message described in d3-voronoi github issue 16

this example uses d3.verbose.js, which is a copy of d3.js v4.2.3 with some logging added to help trace the error message.

see earlier examples:

• working, with another column for x Voronoi clipCells() end[1] null Example
• not working, error reproduced Voronoi clipCells() end[1] null Example II

the code for the d3-voronoi-scatterplot chart plugin is at https://github.com/micahstubbs/d3-voronoi-scatterplot