[BUG] Model Dropdown in Namespace Model Selection Not Handling Null/Undefined Values

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Description

The model select dropdown is potentially having issues handling null or undefined values which is causing the dropdown "selected" text to go blank.

This was discovered in the gl-demo-ultimate-dev-ai-epic-17570, affecting only Code Review Summary, Code Review and Discussion Summary. I've not been able to reproduce this locally in GDK, but I was able to break the model selector in the same way by changing this line to return null or undefined.

We should fix this so it's able to handle null values but we should also investigate why it's happening in the first place (it probably shouldn't).