Census tile and whole-level CSV endpoints now return 404 for invalid geotype and category combinations (v2.145.0)

Fixed

The census CSV tile endpoint GET /v1/census/tiles/{datasetCode}/{geotype}/{tile}/{categoryCode} and whole-level endpoint GET /v1/census/whole/{datasetCode}/{geotype}/{country}/{categoryCode} now return 404 when the categoryCode does not exist, or when the requested geotype is not one the category is served at. Previously these combinations returned an empty CSV with HTTP 200, which a choropleth client could not distinguish from a tile that genuinely has no data.
The 404 body identifies the offending input via the param field (either categoryCode or geotype), and the geotype error lists the geotypes the category is actually available at.

Census tile and whole-level CSV endpoints now return 404 for invalid geotype and category combinations