[MC-152333] Game render crashes when rendering with invalid name on player head

The bug

After giving a player a player head with an invalid owner, the game renderer failed to parse the string, making the game crashes on subsequent attempt to rejoin the server.

How to reproduce

Run:

/give @p player_head{SkullOwner:"_",display:{Name:'{"text":"Steve"}'}}

→ The game crashes

Crash report

19w46b: crash-2019-11-17_18.04.28-client.txt

Description: Rendering entity in world

java.lang.NumberFormatException: For input string: "6uud"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Long.parseLong(Long.java:589)
	at java.lang.Long.valueOf(Long.java:776)
	at java.lang.Long.decode(Long.java:928)
	at java.util.UUID.fromString(UUID.java:200)
	at com.mojang.util.UUIDTypeAdapter.fromString(UUIDTypeAdapter.java:26)
	at com.mojang.util.UUIDTypeAdapter.read(UUIDTypeAdapter.java:18)
	at com.mojang.util.UUIDTypeAdapter.read(UUIDTypeAdapter.java:10)
	at com.google.gson.Gson.fromJson(Gson.java:887)
	at com.google.gson.Gson.fromJson(Gson.java:952)
	at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:162)
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService$GameProfileSerializer.deserialize(YggdrasilAuthenticationService.java:101)
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService$GameProfileSerializer.deserialize(YggdrasilAuthenticationService.java:97)
	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:69)
	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
	at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72)
	at com.google.gson.Gson.fromJson(Gson.java:887)
	at com.google.gson.Gson.fromJson(Gson.java:952)
	at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:162)
	at com.mojang.authlib.yggdrasil.response.ProfileSearchResultsResponse$Serializer.deserialize(ProfileSearchResultsResponse.java:36)
	at com.mojang.authlib.yggdrasil.response.ProfileSearchResultsResponse$Serializer.deserialize(ProfileSearchResultsResponse.java:19)
	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:69)
	at com.google.gson.Gson.fromJson(Gson.java:887)
	at com.google.gson.Gson.fromJson(Gson.java:852)
	at com.google.gson.Gson.fromJson(Gson.java:801)
	at com.google.gson.Gson.fromJson(Gson.java:773)
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:67)
	at com.mojang.authlib.yggdrasil.YggdrasilGameProfileRepository.findProfilesByNames(YggdrasilGameProfileRepository.java:54)
	at zk.a(SourceFile:80)
	at zk.a(SourceFile:140)
	at bxd.b(SourceFile:124)
	at dqe.a(SourceFile:80)
	at dvp.a(SourceFile:112)
	at dvn.a(SourceFile:102)
	at dvn.a(SourceFile:18)
	at duv.a(SourceFile:250)
	at dql.a(SourceFile:1307)
	at dql.a(SourceFile:1137)
	at dqh.a(SourceFile:720)
	at dqh.a(SourceFile:550)
	at dbi.d(SourceFile:932)
	at dbi.b(SourceFile:569)
	at net.minecraft.client.main.Main.main(SourceFile:202)