Display logs properly when they have been archived

When the logs have already been archived, v2 API returns a bare string,
which is not properly processed by CLI.
Ideally the API should be fixed, but v2 is going to be phased out, so
we will patch it up here.

Eventually CLI will use v3 for clearer code.

Hiro Asari authored and committed

Nothing here #1117.4 passed

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