[bug] cannot show gauge threshold when value is 0

[kenchan13]

Hi! I want to set the threshold value in gauge. There is no problem with positive and negative number except '0'.
I checked plotly.js issues and stackoverflow and there is no solution right now.

https://codepen.io/kenchan13/pen/mdrgPBK?editors=1010

Thanks

[antoinerg]

Thanks @kenchan13 for the very clear bug report!