Fix NPE on TileEntitySkull (#3598)

The setGameProfile method on TileEntitySkull is annotated with the @nullable annotation,
but the skull didn't check for null profiles before attempting to retrieve cached skin.
This bug was introduced by the commit making the skull use spigot's User Cache.

Additionally, CraftMetaSkull also had the same issue with a null GameProfile, so this also
ensures it doesn't break.

The whole CraftPlayerProfile class is not null-safe, it requires a GameProfile that isn't
null so we add a Validation on the constructor, that way it is easier to catch this kind
of issue in the future.

Spigot-Server-Patches/0154-Basic-PlayerProfile-API.patch

@@ -7,10 +7,10 @@ Establishes base extension of profile systems for future edits too
 
 diff --git a/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java b/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..f98f4d55b14a59e06fb17a7f7500a2f98cba58a5
+index 0000000000000000000000000000000000000000..676cc44f544715ef375012fa04bdd2d79f79a3aa
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java
-@@ -0,0 +1,285 @@
+@@ -0,0 +1,287 @@
 +package com.destroystokyo.paper.profile;
 +
 +import com.destroystokyo.paper.PaperConfig;
@@ -20,6 +20,7 @@ index 0000000000000000000000000000000000000000..f98f4d55b14a59e06fb17a7f7500a2f9
 +import com.mojang.authlib.properties.PropertyMap;
 +import net.minecraft.server.MinecraftServer;
 +import net.minecraft.server.UserCache;
++import org.apache.commons.lang3.Validate;
 +import org.bukkit.craftbukkit.entity.CraftPlayer;
 +import org.spigotmc.SpigotConfig;
 +
@@ -46,6 +47,7 @@ index 0000000000000000000000000000000000000000..f98f4d55b14a59e06fb17a7f7500a2f9
 +    }
 +
 +    public CraftPlayerProfile(GameProfile profile) {
++        Validate.notNull(profile, "GameProfile cannot be null!");
 +        this.profile = profile;
 +    }
 +
@@ -456,14 +458,14 @@ index ed32242bd169e9f28607942aa31aa48a5799b215..54f80cb8e1b771f2a493543e04f8bc83
          return this.minecraftSessionService;
      }
 diff --git a/src/main/java/net/minecraft/server/TileEntitySkull.java b/src/main/java/net/minecraft/server/TileEntitySkull.java
-index 177cceb77f8783fe93ba7e4342de9c589f155c1b..e2544aeb5a28fd98a4dc162227276b23a99424fc 100644
+index 177cceb77f8783fe93ba7e4342de9c589f155c1b..27613d2e7d2a0de43b1cd8a45cfcfd5553642561 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySkull.java
 +++ b/src/main/java/net/minecraft/server/TileEntitySkull.java
 @@ -158,6 +158,7 @@ public class TileEntitySkull extends TileEntity /*implements ITickable*/ { // Pa
      private void f() {
          // Spigot start
          GameProfile profile = this.gameProfile;
-+        if (profile.isComplete() && profile.getProperties().containsKey("textures")) return; // Paper
++        if (profile != null && profile.isComplete() && profile.getProperties().containsKey("textures")) return; // Paper
          b(profile, new Predicate<GameProfile>() {
  
              @Override
@@ -581,17 +583,19 @@ index f01bd38d0b600a69224f610fd77a542ec6d1c322..95f4abddf57eb8c59cb5a5410b8d551d
      // Paper end
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
-index 4fb27cc7ed062696239f75b6f85ddb0a31866568..52c8d31590ea8e355395fa95cf690cc3770f5f71 100644
+index 4fb27cc7ed062696239f75b6f85ddb0a31866568..35eda0a03cfec244103cfe4b998f9d2b9322fe69 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
-@@ -71,6 +71,11 @@ class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
+@@ -71,6 +71,13 @@ class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
      }
  
      private void setProfile(GameProfile profile) {
 +        // Paper start
-+        com.destroystokyo.paper.profile.CraftPlayerProfile paperProfile = new com.destroystokyo.paper.profile.CraftPlayerProfile(profile);
++        if (profile != null) {
-+        paperProfile.completeFromCache();
++            com.destroystokyo.paper.profile.CraftPlayerProfile paperProfile = new com.destroystokyo.paper.profile.CraftPlayerProfile(profile);
-+        profile = paperProfile.getGameProfile();
++            paperProfile.completeFromCache();
++            profile = paperProfile.getGameProfile();
++        }
 +        // Paper end
          this.profile = profile;
          this.serializedProfile = (profile == null) ? null : GameProfileSerializer.serialize(new NBTTagCompound(), profile);

Spigot-Server-Patches/0191-Add-setPlayerProfile-API-for-Skulls.patch

@@ -48,7 +48,7 @@ index 20588598386a4f479e6a58b294149bed789c63ce..ecc32c2fb1e8e1ac03074102b982adb4
      public BlockFace getRotation() {
          BlockData blockData = getBlockData();
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
-index 52c8d31590ea8e355395fa95cf690cc3770f5f71..2a3c86b0cbce0c37ebd8cace138c72c99f7455ea 100644
+index 35eda0a03cfec244103cfe4b998f9d2b9322fe69..109edb76618025651d05689d9db52248220550ca 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java
 @@ -3,6 +3,8 @@ package org.bukkit.craftbukkit.inventory;
@@ -68,7 +68,7 @@ index 52c8d31590ea8e355395fa95cf690cc3770f5f71..2a3c86b0cbce0c37ebd8cace138c72c9
  @DelegateDeserialization(SerializableMeta.class)
  class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
  
-@@ -138,6 +141,19 @@ class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
+@@ -140,6 +143,19 @@ class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
          return hasOwner() ? profile.getName() : null;
      }