Adding check for name none

[shimwell]

Proposed changes

stp files were being exported with the name as None and saved as None.stp.

This PR adds a check when exporting stp and slt files using the Shape.name. Checks that the Shape.name is not None.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

• Pep8 applied
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

Merging #115 (c21b589) into develop (1f7914d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #115   +/-   ##
========================================
  Coverage    96.87%   96.88%           
========================================
  Files           76       76           
  Lines         4738     4744    +6     
========================================
+ Hits          4590     4596    +6     
  Misses         148      148           

Impacted Files	Coverage Δ
paramak/reactor.py	86.25% <100.00%> (+0.28%)	⬆️

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