Update default value of results from 0.0 to None to align with the default value in speckle-sharp

[ItsPatrickHe]

Description & motivation

I made this PR because in the speckle sharp repository, for example, as you can see for the Result1D class, the initial default value for all the attributes will be null when not set. These are indicated in the type as well. Could you check this PR to see if this change is correct?

Changes:

To-do before merge:

Screenshots:

Validation of changes:

Checklist:

• My pull request follows the guidelines in the Contributing guide?
• My pull request does not duplicate any other open Pull Requests for the same update/change?
• My commits are related to the pull request and do not amend unrelated code or documentation.
• My code follows a similar style to existing code.
• I have added appropriate tests.
• I have updated or added relevant documentation.

References

[codecov]

Codecov Report

Base: 91.21% // Head: 90.71% // Decreases project coverage by -0.49% ⚠️

Coverage data is based on head (c91f673) compared to base (5ae022d).
Patch has no changes to coverable lines.

❗ Current head c91f673 differs from pull request most recent head 659c57e. Consider uploading reports for the commit 659c57e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #240      +/-   ##
==========================================
- Coverage   91.21%   90.71%   -0.50%     
==========================================
  Files          63       58       -5     
  Lines        4312     4016     -296     
==========================================
- Hits         3933     3643     -290     
+ Misses        379      373       -6     

Impacted Files	Coverage Δ
src/specklepy/objects/base.py	78.33% <0.00%> (-3.92%)	⬇️
src/specklepy/objects/other.py	97.36% <0.00%> (-0.51%)	⬇️
src/specklepy/objects/units.py	90.90% <0.00%> (-0.27%)	⬇️
src/specklepy/objects/geometry.py	87.63% <0.00%> (-0.25%)	⬇️
tests/conftest.py	98.64% <0.00%> (ø)
tests/test_base.py	100.00% <0.00%> (ø)
tests/test_user.py	100.00% <0.00%> (ø)
tests/test_branch.py	100.00% <0.00%> (ø)
tests/test_commit.py	100.00% <0.00%> (ø)
tests/test_server.py	96.42% <0.00%> (ø)
... and 51 more

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[RobClaessensRHDHV]

Hi @gjedlicska,
Great that his has been merged, together with your other updates of the specklepy structural objects (#241). We are depending on these updates for our own repo.
Do you know when these updates will be released as pip installable?

[gjedlicska]

Hey @RobClaessensRHDHV

We've just published a new release of specklepy -> 2.11.0
There are a few bigger changes in this one, so please let me know if you run into anything unexpected.

[RobClaessensRHDHV]

@gjedlicska

Nice! We will check it out next week :)