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prefer the simpler
len
check for Multiaddr and== nil
for*Component
.This helps with backward compatibility with v0.14. For example, this change: https://github.com/filecoin-project/lotus/pull/12912/files#diff-dd6a7924e7591cf2ed56af793a333f61f17a4a472d0ea542334ff841f5918c0dL63 would no longer be required.