Add check for null owner #930
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In a normal context the check isn't needed as get entity will just return null but its needed for compatibility with the mod MCMT
MCMT replace the byUuid hasmap in net.minecraft.world.level.entity.EntityLookup by a ConcurrentHashMap so it can be access from multiple threads and this hashmap doesn't check if the key is null before trying to get the hashCode() causing a crash