[Bleeding] Fix NPE with a null bedSpawnLocation. Fixes BUKKIT-1500

src/main/java/net/minecraft/server/EntityHuman.java

@@ -1094,6 +1094,7 @@ public abstract class EntityHuman extends EntityLiving implements ICommandListen
         } else {
             this.c = null;
             this.d = false;
+            this.spawnWorld = ""; // CraftBukkit
         }
     }
 

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -614,8 +614,12 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setBedSpawnLocation(Location location, boolean override) {
-        getHandle().setRespawnPosition(new ChunkCoordinates(location.getBlockX(), location.getBlockY(), location.getBlockZ()), override);
-        getHandle().spawnWorld = location.getWorld().getName();
+        if (location == null) {
+            getHandle().setRespawnPosition(null, override);
+        } else {
+            getHandle().setRespawnPosition(new ChunkCoordinates(location.getBlockX(), location.getBlockY(), location.getBlockZ()), override);
+            getHandle().spawnWorld = location.getWorld().getName();
+        }
     }
 
     public void hidePlayer(Player player) {