Fix issues with getBlockState(false) not loading Tile Entity data

This only impacted people who used our useSnapshots new API in a plugin,
which obviously was no one as the data result was completely broken.

Merged the NPE check patch into mine since it has to handle it too.

Spigot-Server-Patches/Configurable-Unrestricted-Signs.patch

@@ -18,7 +18,7 @@ Creative servers should absolutely never enable this.
 Non creative servers, enable at own risk!!!
 
 diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
-index 3f2c5b2d..67bd3bcb 100644
+index 3f2c5b2d5..67bd3bcbe 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySign.java
 +++ b/src/main/java/net/minecraft/server/TileEntitySign.java
 @@ -0,0 +0,0 @@ public class TileEntitySign extends TileEntity {
@@ -46,7 +46,7 @@ index 3f2c5b2d..67bd3bcb 100644
 +    public interface ISignCommandListener extends ICommandListener {} // Paper
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index e86c1675..6095948e 100644
+index e86c16755..6095948e8 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -0,0 +0,0 @@ public final class CraftServer implements Server {