Conflicts:
	Cargo.lock
	xtask/Cargo.toml
	xtask/src/main.rs

Fix #62

Since commit 012d096f,  IdentityIndexOf it's correctly pruned. Before this commit, we found the associated author, even for a removed identity, it still failed when we tried to modify the identity, but then the error returned was not the right one.

pending mb expiration should be applied only if pending mb exist
Fix #51