Issue description: Upon removing a Shield Projector Tier 1, the server crashed. Does not matter if on or off

Steps to reproduce: Destroy a Shield Projector Tier 1

Versions:

• Minecraft: 1.12.2 Using FTB Direwolf20 modpack
• Forge: forge-1.12.2-14.23.2.2611
• CompatLayer (only if on Minecraft 1.10 or 1.11):
• McJtyLib: mcjtylib-1.12-2.6.4
• RFTools: rftools-1.12-7.29 rftoolsctrl-1.12-1.8.0 rftoolsdim-1.12-5.52

Possibly incompatible mods and versions: Using Optifine on clientside

Relevant logs, if any:

Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
at mcjty.rftools.blocks.shield.ShieldTEBase.writeClientDataToNBT(ShieldTEBase.java:975)
at mcjty.lib.entity.GenericTileEntity.func_189518_D_(GenericTileEntity.java:123)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187273_a(PlayerChunkMapEntry.java:288)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187280_d(PlayerChunkMapEntry.java:250)
at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:115)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:227)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Unknown Source)

Found out it only happens when you remove the Shield Template before removing the Shield Projector

Duplicate of #1645. Has been fixed since version 7.30.