Check that phantom spawned uuid is set for save/load

Fixes #1408

Spawn eggs wont have a player set

Spigot-Server-Patches/0349-Add-PhantomPreSpawnEvent.patch

@@ -1,30 +1,38 @@
-From b0103cefc4681ecee343d74439e248db5ed62cbd Mon Sep 17 00:00:00 2001
+From a45277ffe97ecfe82bc0ebb7c6ff76e543e72ec2 Mon Sep 17 00:00:00 2001
 From: BillyGalbreath <Blake.Galbreath@GMail.com>
 Date: Sat, 25 Aug 2018 19:56:51 -0500
 Subject: [PATCH] Add PhantomPreSpawnEvent
 
 
 diff --git a/src/main/java/net/minecraft/server/EntityPhantom.java b/src/main/java/net/minecraft/server/EntityPhantom.java
-index 2429644e99..2778660acd 100644
+index 2429644e9..e27600109 100644
 --- a/src/main/java/net/minecraft/server/EntityPhantom.java
 +++ b/src/main/java/net/minecraft/server/EntityPhantom.java
-@@ -128,6 +128,7 @@ public class EntityPhantom extends EntityFlying implements IMonster {
+@@ -128,6 +128,11 @@ public class EntityPhantom extends EntityFlying implements IMonster {
          }
  
          this.setSize(nbttagcompound.getInt("Size"));
-+        this.spawningEntity = nbttagcompound.getUUID("Paper.SpawningEntity"); // Paper
++        // Paper start
++        if (nbttagcompound.hasUUID("Paper.SpawningEntity")) {
++            this.spawningEntity = nbttagcompound.getUUID("Paper.SpawningEntity");
++        }
++        // Paper end
      }
  
      public void b(NBTTagCompound nbttagcompound) {
-@@ -136,6 +137,7 @@ public class EntityPhantom extends EntityFlying implements IMonster {
+@@ -136,6 +141,11 @@ public class EntityPhantom extends EntityFlying implements IMonster {
          nbttagcompound.setInt("AY", this.c.getY());
          nbttagcompound.setInt("AZ", this.c.getZ());
          nbttagcompound.setInt("Size", this.getSize());
-+        nbttagcompound.setUUID("Paper.SpawningEntity", this.spawningEntity); // Paper
++        // Paper start
++        if (this.spawningEntity != null) {
++            nbttagcompound.setUUID("Paper.SpawningEntity", this.spawningEntity);
++        }
++        // Paper end
      }
  
      public SoundCategory bV() {
-@@ -171,6 +173,14 @@ public class EntityPhantom extends EntityFlying implements IMonster {
+@@ -171,6 +181,14 @@ public class EntityPhantom extends EntityFlying implements IMonster {
          return true;
      }
  
@@ -40,7 +48,7 @@ index 2429644e99..2778660acd 100644
  
          private int b;
 diff --git a/src/main/java/net/minecraft/server/MobSpawnerPhantom.java b/src/main/java/net/minecraft/server/MobSpawnerPhantom.java
-index 0626b77904..413188e970 100644
+index 0626b7790..413188e97 100644
 --- a/src/main/java/net/minecraft/server/MobSpawnerPhantom.java
 +++ b/src/main/java/net/minecraft/server/MobSpawnerPhantom.java
 @@ -50,8 +50,17 @@ public class MobSpawnerPhantom {
@@ -63,7 +71,7 @@ index 0626b77904..413188e970 100644
                                                  groupdataentity = entityphantom.prepare(difficultydamagescaler, groupdataentity, (NBTTagCompound) null);
                                                  world.addEntity(entityphantom, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NATURAL); // CraftBukkit
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPhantom.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPhantom.java
-index 9f9ee92390..2b97313694 100644
+index 9f9ee9239..2b9731369 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPhantom.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPhantom.java
 @@ -35,4 +35,10 @@ public class CraftPhantom extends CraftFlying implements Phantom {