Review Request 39507: Check message.empty() in Slave::shutdown before log it

[Guangya Liu]

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Review request for mesos and Till Toenshoff.


Bugs: MESOS-3769
    https://issues.apache.org/jira/browse/MESOS-3769


Repository: mesos


Description
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Check message.empty() in Slave::shutdown before log it


Diffs
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  src/slave/slave.cpp 652697688fd9e9a6d064ef01fb032393412307b3 

Diff: https://reviews.apache.org/r/39507/diff/


Testing
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Thanks,

Guangya Liu