Use exist property instead of deleted for better handle of nil values

[thisisommore]

Issue by thisisommore
Monday Mar 14, 2022 at 09:29 GMT
Originally opened as https://github.com/TheLazarusNetwork/marketplace-contracts/issues/28

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Every Boolean is false in smartcontract when that item doesn't exist. So if item doesn't exist and deleted in MarketItem is false then it means that item still exist and which is not true so to fix that we can replace it with exist property which can be false for nil items and therefore servers the purpose