Fix null handling in FEMesh

[JosefTaylor]

NOTE: Depends on

Issues addressed by this PR

Closes #384

Also related to #352

Test files

https://burohappold.sharepoint.com/:f:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/ETABS_Toolkit/%23385-fix-FEMesh-read-method?csf=1&web=1&e=1WOL2g

Changelog

Additional comments

[JosefTaylor]

@BHoMBot check required

[bhombot-ci]

@JosefTaylor to confirm, the following checks are now queued:

• code-compliance
• documentation-compliance
• project-compliance
• core
• null-handling
• serialisation
• installer
• versioning

[JosefTaylor]

@BHoMBot check core

[bhombot-ci]

@JosefTaylor to confirm, the following checks are now queued:

• core

[bhombot-ci]

The check core has already been run previously and recorded as a successful check. This check has not been run again at this time.

[JosefTaylor]

@BHoMBot check compliance

[bhombot-ci]

@JosefTaylor to confirm, the following checks are now queued:

• code-compliance
• documentation-compliance
• project-compliance
• branch-compliance
• dataset-compliance
• copyright-compliance

[bhombot-ci]

The check code-compliance has already been run previously and recorded as a successful check. This check has not been run again at this time.

[bhombot-ci]

The check documentation-compliance has already been run previously and recorded as a successful check. This check has not been run again at this time.

[bhombot-ci]

The check project-compliance has already been run previously and recorded as a successful check. This check has not been run again at this time.

[JosefTaylor]

/azp run ETABS_Toolkit.CheckCore

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mchaf]

LGTM, king