Fixes bug whereby pulling a MeshSettings1D with div = 1 returns an error

[peterjamesnugent]

Issues addressed by this PR

Closes #404

Test files

https://burohappold.sharepoint.com/:u:/r/sites/BHoM/02_Current/12_Scripts/01_Issue/BHoM/Lusas_Toolkit/%23404%20Pull%20MeshSettings1D/PullMeshSettings1D.gh?csf=1&web=1&e=zU6eQp

Changelog

Additional comments

[KalleEdstroem]

Tested for Lusas v.20.0 and v21.0 using the testscript provided. Works as expected and no error occurs when pulling a MeshSettings1D with divisions = 1.
Happy to approve for Lusas v.20.0 and v.21.0.

[FraserGreenroyd]

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