Icons missing in the spawn menu - Proton

[bugswillhappen]

https://www.youtube.com/watch?v=vQ41iN73mEs - Reference
Same complication as issue #171

Icons are missing when using Proton.

[Generic] Value cannot be null. (Parameter 'text')
System.ArgumentNullException: Value cannot be null. (Parameter 'text')
at Topten.RichTextKit.FontRun.Paint(PaintTextContext ctx)
at Topten.RichTextKit.TextBlock.Paint(SKCanvas canvas, TextPaintOptions options)
at Sandbox.UI.TextBlock.RebuildTexture(Single maxwidth, Single maxheight)
at Sandbox.UI.TextBlock.SizeFinalized(Single width, Single height)
at Sandbox.UI.Label.DrawContent(CommandList commandList, PanelRenderer renderer, RenderState& state)
at Sandbox.UI.PanelRenderer.BuildCommandLists(Panel panel, RenderState state)