Github user anshul1886 commented on the pull request:
https://github.com/apache/cloudstack/pull/39#issuecomment-63429460
Actually null has different meaning than false. False means that vm is not
alive while null means it cannot be determined whether it is alive or not.
This is existing functionality for all hypervisor investigators so it
doesn't make sense to write unit tests for this. This got changed to this
behavior while fixing findbug bugs. Better would be to use enum to represent
various better states. But that will require many changes and can be taken for
next release.
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