[#380] Add support for sapling transactions
Description
Actually, we are not planning to support it (see #380 (closed)), so this MR just makes little chore in the codebase to make our tests pass in the future.
Related issue(s)
Resolves #380 (closed)
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Tests (see short guidelines)
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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