Windows Terminal crashes when a profile's icon URL or background is unparseable/invalid

I got the latest from choco and set up an Ubuntu terminal entry. I found that if I put a garbage URL in the profiles.json icon setting entry it crashes Windows Terminal and WT won't start thereafter. 

That probably shouldn't happen, though technically low priority its probably making WT look fragile. 

To repeat this behavior simply remove "ms-appx:" from any icon path. 