https://github.com/code-423n4/2024-08-superposition/blob/4528c9d2dbe1550d2660dac903a8246076044905/pkg/sol/OwnershipNFTs.sol#L182
tokenURI doesnt enforce that the token being checked is a valid token, which can lead to malicious users impersonating bogus NFTs as the ownership NFT. Unsuspecting users would attempt to query the token uri and would be returned with a valid uri, since the function doesnt ensure that the tokenId is a valid NFT.
Also, according to EIP-721 metadata standard, the function should revert if _tokenId is not a valid NFT.
Add the check for NFT existence in the function by checking that the owner is not address(0).
