Pet Buddy Mod

fixed nullpointer crashed due to null checks not being repalced with ItemStack.EMPTY

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---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 5/7/17 7:37 PM
Description: Ticking entity

java.lang.NullPointerException: The validated object is null
    at org.apache.commons.lang3.Validate.notNull(Validate.java:222)
    at org.apache.commons.lang3.Validate.notNull(Validate.java:203)
    at net.minecraft.util.NonNullList.set(SourceFile:45)
    at net.minecraft.entity.EntityLiving.func_184201_a(EntityLiving.java:922)
    at subaraki.petbuddy.entity.EntityPetBuddy.func_184201_a(EntityPetBuddy.java:114)
    at subaraki.petbuddy.entity.EntityPetBuddy.func_70675_k(EntityPetBuddy.java:200)