remove bugged PlacedItem tile entities properly

src/main/java/com/brandon3055/draconicevolution/common/tileentities/TilePlacedItem.java

@@ -1,5 +1,6 @@
 package com.brandon3055.draconicevolution.common.tileentities;
 
+import net.minecraft.init.Blocks;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.network.NetworkManager;
@@ -9,6 +10,7 @@
 import net.minecraft.util.Vec3;
 
 import com.brandon3055.draconicevolution.common.ModBlocks;
+import com.brandon3055.draconicevolution.common.utills.LogHelper;
 
 /**
  * Created by Brandon on 14/08/2014.
@@ -67,10 +69,14 @@ public void readFromNBT(NBTTagCompound compound) {
         tag[0] = compound.getCompoundTag("Item" + 0);
         stack = ItemStack.loadItemStackFromNBT(tag[0]);
         if (stack == null) {
-            throw new NullPointerException(
+            // the stack can be null if the placed item was
+            // an item that got removed in between mod updates
+            stack = new ItemStack(Blocks.stone);
+            this.invalidate();
+            LogHelper.error(
                     "Cannot load the Placed Item at location "
                             + Vec3.createVectorHelper(this.xCoord, this.yCoord, this.zCoord)
-                            + " because the associated item is null!");
+                            + " because the associated item is null, it will be removed.");
         }
         rotation = compound.getFloat("Rotation");
     }