Review Request 52015: Used {} instead of Hook::None() in libprocess.

[Joerg Schad]

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Review request for mesos and Jie Yu.


Repository: mesos


Description
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Used {} instead of Hook::None() in libprocess.


Diffs
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  3rdparty/libprocess/include/process/subprocess_base.hpp 
acd23c99162f164c02a7781abeb95b3c220ead12 

Diff: https://reviews.apache.org/r/52015/diff/


Testing
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sudo make check + internal ci


Thanks,

Joerg Schad