[Bug]: No Error thrown when Geojson does not contain property

[archiewood]

Describe the bug

If you attempt to use a geojson to create an areamap, you must pass a geoId, corresponding to one of the properties for each of the features in the geojson.

However, if you

• try to use something other than a property (eg the name) or
• spell the property wrong,

then you get no map, and no error telling you what the problem is

Evidence should throw an error like No property [name you typed] found in [geojson_file]

Steps to Reproduce

https://evidencedev.slack.com/archives/C023LRB9Z40/p1738775103985879

Severity

annoyance