Handle characters that aren't fully loaded yet in UpdateName

src/types/unitframe.lua

@@ -446,7 +446,10 @@ end
 function UnitFrame:UpdateName()
     if UnitIsPlayer(self.unit) then
         local _, class = UnitClass(self.unit)
-        local color = RAID_CLASS_COLORS[class]
+        -- TODO: UnitClass can return Unknown and the color can be nil. Having
+        -- the unit exist but not fully loaded is possibly a state we want to
+        -- handle more generally
+        local color = RAID_CLASS_COLORS[class] or {r=1, g=1, b=1}
         self.name:SetTextColor(color.r, color.g, color.b)
     else
         self.name:SetTextColor(1, 1, 1)