pygeoapi fails to gracefully catch missing tiles

[webb-ben]

Description
Per the OGC API - TIles spec, tiles that are not found are supposed to return a 400 or 404 status. pygeoapi does this, but at the cost of logging a full error stack for every tile requested that does not exist.

Steps to Reproduce

1. Run pygeoapi with a Tile provider and log level set to error.
2. View tile map, in and out of where there map be tiles.
3. View pygeoapi logs

Expected behavior
pygeoapi is able to return the proper HTTP status without spamming the logs for an expected behavior.

Screenshots/Tracebacks
500+ errors from last 15 minutes

Environment

• OS: all
• Python version: 3.10
• pygeoapi version: 0.20.dev0

Additional context
pygeoapi tile providers could consistently throw ProviderTileNotFoundError which can be handled in api/tiles.py to gracefully return such an error. Not sure it is wise to rely on ProviderTileNotFoundError.