Fix WMTSFacade provider

[Dolite]

'style' query parameter is mandatory according to WMTS 1.0.0 standard. For backwards compatibility, empty string remains as default value.

Overview

Related Issue / discussion

Additional information

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

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(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute bugfix to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[doublebyte1]

@Dolite Thank You for this enhancement to the provider, by exposing the style parameter, which currently is set to ' ' . When this parameter is empty, the server always fallbacks to the default style; In my comment I suggest you update the description on the documentation to make this behaviour more clear.

Please note that this is not a bug, as the provider does not necessarily need to expose all the mandatory parameters of WMTS; I think keeping it optional, as you did, is a good idea; to support backwards compatibility and also to make configuration easier for the users.

[doublebyte1]

Ready to merge

[doublebyte1]

Vulnerability check seems to be unrelated