Missing data does not fail gracefully

[wrobstory]

For Choropleth maps, if the GeoJSON and JSON data do not match, the color defaults to the highest in the scale. It would be preferable for it to default to white, in order to recognize that the value is missing.

[wrobstory]

Fixed in 8269f81

[scardine]

Defaulting to transparent could be more appropriate, because when you are using some color scale starting or ending in white the result is potentially misleading.

Having this as a parameter would be even better because it would allow for better legends.

There are several valid reasons for omitting data related to certain features, and you may want to show them distinctly:

• anonymity and privacy concerns when the number of events is very small for some region
• data not available
• lack of events
• not applicable

[wrobstory]

Yep, all good points. I just changed it so that it defaults to null rather than #fff. Any data that isn't matched to a key is automatically "nulled", which causes that area to be blank.

Thank you!