Ryan Liang e704e83402 Unity: fail to detach lun when auto zone enabled ...

When the lun is the last one attached to the host and it is detached,
the attribute `host.host_luns` is None. Use `not` in if statement which
is pythonic in checking None and empty list of `host.host_luns`.

Change-Id: I5d8f63f9a78d001bc699af538f586aab8d73a5cf
Closes-bug: #1759175
(cherry picked from commit c816be897e)
(cherry picked from commit febe57cfee)
(cherry picked from commit ead818199e)

2019-01-16 15:53:00 +08:00

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