Fix a null pointer in ShapeDetectorBlock

nms-patches/ShapeDetectorBlock.patch

@@ -0,0 +1,15 @@
+--- ../work/decompile-8eb82bde//net/minecraft/server/ShapeDetectorBlock.java	2015-02-02 20:26:40.044135504 +0000
++++ src/main/java/net/minecraft/server/ShapeDetectorBlock.java	2015-02-02 20:26:40.056135504 +0000
+@@ -16,8 +16,10 @@
+     }
+ 
+     public IBlockData a() {
+-        if (this.c == null && this.a.isLoaded(this.b)) {
+-            this.c = this.a.getType(this.b);
++        // CraftBukkit start - fix null pointer
++        if (this.c == null) {
++            this.c = this.a.isLoaded(this.b) ? this.a.getType(this.b) : Blocks.AIR.getBlockData();
++        // CraftBukkit end
+         }
+ 
+         return this.c;