* Update nx584 requirement to 0.4
There have been a few bug fixes to nx584 since 0.2, so this just updates
our requirement to pull in the newer version.
* Fix nx584 if no partitions are found
If we succeed in our connection to the panel but find no
configured partitions, then we will fall through to the bypass
probe and fail because 'zones' is never initialized. This fixes
both exception paths and adds a test that would poke it.
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