Unhandled exception when pmtiles is used and GeoJSON is requested

[Jollyfant]

In serve_data.js an exception is triggered because isGzipped is undefined: https://github.com/maptiler/tileserver-gl/blob/master/src/serve_data.js#L73 when pmtiles is used as data source and GeoJSON is requested.

Solution is to either add a check for Gzip magic bytes as per https://github.com/maptiler/tileserver-gl/blob/master/src/serve_data.js#L120 or remove the check entirely.

[acalcutt]

I think that check should probably be removed, since the data from pmtiles getZxy function is already ungzipped
https://github.com/protomaps/PMTiles/blob/main/js/index.ts#L987

I removed similar checks in the area you mentioned, but that one must have been missed.

a PR to remove that check is welcome.

[acalcutt]

Just wondering, do you have an example pmtiles geojson file I can test with? The PR looks good, I just realized geojson pmtiles isn't something I have tested before.

[acalcutt]

Nevermind, I forgot this isn't a geojson formatted pmtiles, but a pbf pmtiles in geojson format. I can test with what I have.

[acalcutt]

Thank for the PR, it has been merged. I will try to make a new release when I get home later tonight.

[acalcutt]

Fixed by #1188