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.

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#

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# Avoid interference from actual test env:

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unset HGTEST_JOBS

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unset HGTEST_TIMEOUT

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unset HGTEST_PORT

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unset HGTEST_SHELL