Jonas Nick 3d243d8a49 BIP 341: allow taproot_sign_key with no script tree ...

In contrast to taproot_output_script, taproot_sign_key was not able to deal with
a script_tree that is None. This commit fixes taproot_sign_key such that it can
sign for such outputs.

This commit avoids changing the behavior of the functions except
taproot_sign_key at the cost of having some code duplication. Alternatively, one
could let taproot_tree_helper deal with a None script_tree directly.

2023-01-04 14:31:44 +00:00

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