branchmap: simplify error handlind when writing rev branch cache
Now that we have a general try except, we can move the error handling from the
individual writes in it.
Code will be reindented in the next changeset to help this on readability.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
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$ hg debuginstall # sanity-check setup
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Running without installing:
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See https://mercurial-scm.org/ for detailed installation
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