Fix crash in Window Assembly report with multiple shading states

[vidanovic]

Pull request overview

• Fixes Window Assembly NFRC for report (Tarcog) related crash in v22.1 IOFreeze #9330 (IF THIS IS A DEFECT)
• Fixing issue in case when multiple shading states are used

NOTE: ENHANCEMENTS MUST FOLLOW A SUBMISSION PROCESS INCLUDING A FEATURE PROPOSAL AND DESIGN DOCUMENT PRIOR TO SUBMITTING CODE

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[mjwitte]

@vidanovic Thanks for the fix. Defect file runs without a crash now.
@Myoldmopar Permission to merge?

[Myoldmopar]

Yep, please go ahead and merge at will to fix the crash