Null check isApplicable for CraftBlockEntityState#update

If the update call removed the TE, then isApplicable would
have NPE'd.

patches/server/Null-check-isApplicable-for-CraftBlockEntityState-up.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Tue, 12 Oct 2021 13:32:52 -0700
+Subject: [PATCH] Null check isApplicable for CraftBlockEntityState#update
+
+If the update call removed the TE, then isApplicable would
+have NPE'd.
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
++++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
+@@ -0,0 +0,0 @@ public abstract class CraftBlockEntityState<T extends BlockEntity> extends Craft
+     }
+ 
+     protected boolean isApplicable(BlockEntity tileEntity) {
+-        return this.tileEntity.getClass() == tileEntity.getClass();
++        return tileEntity != null && this.tileEntity.getClass() == tileEntity.getClass(); // Paper - fix NPE if the TE was removed
+     }
+ 
+     @Override