fix(device): discard Cloud APIs empty states (connection resets)

[palazzem]

Related Issues

• Follow-up fix(collector): return previous states when the device is disconnected #150
• Closes Integration state switches frequently to "Unavailable" when there is a blip with the Cloud API polling #148

Proposed Changes:

This change handles updates when a connection reset happens. In that case, the last_id is equal 1, meaning the Cloud API returns an empty state. With this change such updates are discarded and a full update is forced to reconcile the actual (cached) state, with the real one.

Testing:

1. Activate at least one sector
2. Disconnect the main unit
3. Wait the Integration to use a cached state (you should see errors in logs)
4. Reconnect the main unit
5. The integration must not change the alarm state (if the bug is present, it will go in "Disarmed" and then back to the actual state).

Extra Notes (optional):

n/a

Checklist

• Related issues and proposed changes are filled
• Tests are defining the correct and expected behavior
• Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 8143683054

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 93.993%

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Totals
Change from base Build 8113263050:	0.03%
Covered Lines:	676
Relevant Lines:	723

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💛 - Coveralls

[palazzem]

Confirmed by @andr3a88 that the fix works. Merging! 🎉