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RPC error replies always as dictionaries
Merge pull request #27 from adrpar/improved_errors

RPC error replies always as dictionaries
Merge pull request #28 from mouadino/uniform-cli-output

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Handle errors in 'lymph inspect'

Add negative test case to cover error handling for both 'lymph request' and
'lymph inspect'.
Merge pull request #29 from mouadino/error_handling_inspect

Handle errors in 'lymph inspect'