fix: catch null byte error from pgstac

[vincentsarago]

another take at #256

@captaincoordinates here is another attempt at #256

Instead of cleaning the request using a middleware, I think it's better (IMO) to catch the error from Postgres and raise a generic error.

curl http://127.0.0.1:8080/collections/noaa-emergency-response%00/info
{
  "detail": "Backend returned an error for Collection `noaa-emergency-response\u0000`"
}


curl http://127.0.0.1:8080/collections/noaa-emergency-response/tiles/WebMercatorQuad/0/0/0/assets?sortby=id%00
{
  "detail": "Backend returned an error for mosaic with body {\"collections\":[\"noaa-emergency-response\"],\"sortby\":[{\"field\":\"id\\u0000\",\"direction\":\"asc\"}],\"filter-lang\":\"cql2-json\"}"
}

[captaincoordinates]

I'm good with this, thanks for making a change.