key-error when requesting map in non supported crs code

[pvgenuchten]

Is your feature request related to a problem? Please describe.

When requesting a map in epsg:3857 http://localhost:5000/collections/mapserver_world_map/map?f=png&bbox-crs=EPSG:3857&
the follwoing error is displayed:

File "/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/flask_app.py", line 160, in execute_from_flask
headers, status, content = api_function(api_, api_request, *args)
File "/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/api/maps.py", line 160, in get_collection_map
data = p.query(**query_args)
File "/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/provider/wms_facade.py", line 93, in query
LOGGER.debug(f'Output CRS: {CRS_CODES[crs]}')
KeyError: 'EPSG:3857'

the reason is clear, i'm requesting a map in non supported projection, however would be nice to have a better error discription. Seems the bbox is expected as http://www.opengis.net/def/crs/EPSG/0/3857. However when I run this request, a nill image is returned:

https://demo.pygeoapi.io/master/collections/mapserver_world_map/map?f=png&bbox-crs=http://www.opengis.net/def/crs/EPSG/0/3857&service=WMS&request=GetMap&layers=&styles=&format=image%2Fjpeg&transparent=false&version=1.1.1&width=256&height=256&srs=EPSG%3A3857&bbox=-3757032.814272984,3757032.8142729844,-2504688.5428486555,5009377.085697314

in logs the following error is displayed:

[2024-05-11T15:48:02Z] {/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/api/__init__.py:1393} ERROR - query error (check logs)
Traceback (most recent call last):
  File "/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/api/maps.py", line 160, in get_collection_map
    data = p.query(**query_args)
  File "/mnt/c/projects/geopython/lib/python3.10/site-packages/pygeoapi-0.17.dev0-py3.10.egg/pygeoapi/provider/wms_facade.py", line 138, in query
    raise ProviderQueryError(msg)
pygeoapi.provider.base.ProviderQueryError: WMS error: b'<?xml version=\'1.0\' encoding="UTF-8" standalone="no" ?>\n<ServiceExceptionReport version="1.3.0" xmlns="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/ogc http://schemas.opengis.net/wms/1.3.0/exceptions_1_3_0.xsd">\n<ServiceException>\nmsWMSLoadGetMapParams(): WMS server error. Invalid values for BBOX.\n</ServiceException>\n</ServiceExceptionReport>\n'

the wms backend seems to not support the 3857 projection, suggestion here would be to return an error in stead of an empty image

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