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Pull Request Prelude
Changes Proposed
If an item is not valid (it doesn't exist in items.xml), do not allow
NPC to show it on trade window.
Issues addressed:
Steps to reproduce issue:
Create an npc that sells or buys an item that doesn't exist (for instance, copying from other distros with more items, such as tibia 12 items in 10.98 TFS distro) and ask him/her to trade. You'll see some empty items.