Allow geometry_type to be None at the type level to match documentation

[logankaser]

Description

Allow geometry_type to be None at the type level to match documentation.
Fixes a common type checking error when using geoalchemy

Checklist

This pull request is:

• A documentation / typographical error fix
  • Good to go, no issue or tests are needed
• A short code fix
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the issue).
  • Please include tests that fail with the main branch and pass with the provided fix.
• A new feature implementation or update an existing feature
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the feature).
  • Please include tests that cover every lines of the new/updated feature.
  • Please update the documentation to describe the new/updated feature.

[adrien-berchet]

Hi @logankaser
Thank you very much for this work!
The other parameters of this function don't cause any issue? Because there are other parameters that are optional so I'm wondering.

[logankaser]

I think we just were not using the other arguments on my team, hopefully these types are accurate as
I've not used those arguments.

[adrien-berchet]

I think we just were not using the other arguments on my team, hopefully these types are accurate as I've not used those arguments.

Ok, I see :)
Thanks for the new change!

[adrien-berchet]

Thank you very much!
I'm going to push a new release to make these change available.

[adrien-berchet]

The new release is available: https://pypi.org/project/GeoAlchemy2/0.14.7