TinyDB: fix spatial queries against null geometries

[tomkralidis]

Overview

This PR fixes TinyDB spatial queries against features whose geometry is null.

Related Issue / discussion

geopython/demo.pygeoapi.io#72 (comment)

Additional information

None

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

Contributions and licensing

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

• I'd like to contribute [feature X|bugfix Y|docs|something else] 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

[tomkralidis]

CI failure is unrelated/intermittent.

[pvgenuchten]

it solves the case, just wondering if a try-except wouldn't be better, in case the geometry is not empty but invalid for example.

[tomkralidis]

it solves the case, just wondering if a try-except wouldn't be better, in case the geometry is not empty but invalid for example.

Good idea @pvgenuchten. PR updated.

[justb4]

LGTM, also the test with null geom!