Fix crashes when beacons have invalid effects

nms-patches/TileEntityBeacon.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde//net/minecraft/server/TileEntityBeacon.java	2014-11-28 17:43:43.389707429 +0000
+--- ../work/decompile-8eb82bde//net/minecraft/server/TileEntityBeacon.java	2014-12-27 14:03:08.349290689 +0000
-+++ src/main/java/net/minecraft/server/TileEntityBeacon.java	2014-11-28 17:38:23.000000000 +0000
++++ src/main/java/net/minecraft/server/TileEntityBeacon.java	2014-12-27 14:03:08.349290689 +0000
 @@ -5,6 +5,11 @@
  import java.util.Iterator;
  import java.util.List;
@@ -43,6 +43,17 @@
  
      public TileEntityBeacon() {}
  
+@@ -169,8 +198,8 @@
+ 
+     public void a(NBTTagCompound nbttagcompound) {
+         super.a(nbttagcompound);
+-        this.k = nbttagcompound.getInt("Primary");
+-        this.l = nbttagcompound.getInt("Secondary");
++        this.k = validateEffect(nbttagcompound.getInt("Primary")); // CraftBukkit
++        this.l = validateEffect(nbttagcompound.getInt("Secondary")); // CraftBukkit
+         this.j = nbttagcompound.getInt("Levels");
+     }
+ 
 @@ -182,7 +211,7 @@
      }
  
@@ -52,3 +63,28 @@
      }
  
      public ItemStack getItem(int i) {
+@@ -282,11 +311,11 @@
+             break;
+ 
+         case 1:
+-            this.k = j;
++            this.k = validateEffect(j); // CraftBukkit
+             break;
+ 
+         case 2:
+-            this.l = j;
++            this.l = validateEffect(j); // CraftBukkit
+         }
+ 
+     }
+@@ -307,4 +336,10 @@
+             return super.c(i, j);
+         }
+     }
++
++    // CraftBukkit start
++    public int validateEffect(int i) {
++        return i < 0 || i >= MobEffectList.byId.length || MobEffectList.byId[i] == null ? 0 : i;
++    }
++    // CraftBukkit end
+ }