view docs/figures/figure-sg08-a.svg @ 6549:e45bfd1e0588

topic: don't write namespace into commit extras if there's no topic

Topic namespace is considered a part of topic, but topic is more important than
just namespace alone, so it doesn't make a lot of sense to have topic namespace
on a commit unless it also has topic.

We could simple ignore topic namespace in such cases, but it makes sense to not
record it at all.

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