fix: nil-check GetAppliedDescription before use

src/convert.luau

@@ -1,45 +1,7 @@
 local convert = {}
 
 local faceByMesh = require("./faceByMesh")
-
-local meshByName: {[string]: number} = {
-	["Barrel"] = 6340170,
-	["Blockhead"] = 6340101,
-	["Cheeks"] = 746767604,
-	["Chiseled"] = 616387160,
-	["ClassicFemaleV2"] = 4637266996,
-	["ClassicMaleV2"] = 4637245706,
-	["CoolThing"] = 6340258,
-	["CylinderMadness"] = 6340192,
-	["Diamond"] = 8330576,
-	["EraserHead"] = 6340161,
-	["FatHead"] = 8330389,
-	["FlatTop"] = 6340208,
-	["GoldenKorbloxGeneral"] = 6678831309,
-	["GoldenMrRobot"] = 6653077909,
-	["HeadlessHead"] = 134082579,
-	["Hex"] = 6340141,
-	["iBot"] = 100302996,
-	["KnightOfChivalry"] = 2510300430,
-	["KnightOfCourage"] = 2535709102,
-	["ManHead"] = 86498048,
-	["MercilessNinja"] = 6652984223,
-	["MrToilet"] = 4416630203,
-	["Narrow"] = 746774687,
-	["NeoClassicFemaleV2"] = 4637441617,
-	["NeoClassicMaleV2"] = 4637163809,
-	["Octoblox"] = 6340133,
-	["Paragon"] = 616398268,
-	["Peabrain"] = 8330578,
-	["Perfection"] = 6340269,
-	["RobloxClassic"] = 2432102561,
-	["Roll"] = 6340198,
-	["Roundy"] = 6340213,
-	["RoxBox"] = 6340154,
-	["TheEngineer"] = 6711225558,
-	["Trim"] = 6340227,
-	["WomanHead"] = 86498113,
-}
+local meshByName = require("./meshByName")
 
 local function headMeshFromHumanoidDescription(humDesc: HumanoidDescription): number
 	for _, bodyPartDescription in humDesc:GetChildren() do
@@ -54,11 +16,15 @@ end
 
 function convert.convertCharacter(humanoid: Humanoid): ()
 	local humDesc = humanoid:GetAppliedDescription()
+	if humDesc == nil then
+		return
+	end
 	local currentMesh = humDesc.Head
 	local targetMesh = headMeshFromHumanoidDescription(humDesc)
 	local face = faceByMesh[currentMesh]
 
 	if face == nil then
+		warn(`rbx-reface: no face mapping for mesh {currentMesh}`)
 		return
 	end