fix psd scaling checks

[goulart-paul]

Fixes a panic / crash condition in PSD scaling step

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (develop@f8a1f1a). Click here to learn what that means.

Files	Patch %	Lines
src/cones/coneops_psdtrianglecone.jl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #158   +/-   ##
==========================================
  Coverage           ?   82.75%           
==========================================
  Files              ?       44           
  Lines              ?     3293           
  Branches           ?        0           
==========================================
  Hits               ?     2725           
  Misses             ?      568           
  Partials           ?        0           

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