fix/snapshot's zeroed account as optional #170
Merged
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Fixes https://ackeeblockchain.atlassian.net/browse/TRD-62
When using the anchor constraint #[account(zero)], the account exists but the data is empty. This constraint is not handled similarly to the init constraint where the accounts_snapshot field is wrapped in an Option and therefore the deserialization fails and it causes a fuzzing crash.
The expected behavior is that the account should be wrapped in an Option and set to None, in case the data is empty.