BUGFIX EXTPLESK-8950 Fix case when getAll returns 1 database instead of 0

[whytea91]

When there are no databases on a domain, the API returns:

<?xml version="1.0" encoding="UTF-8"?>
<packet version="1.6.9.1">
    <database>
        <get-db>
            <result>
                <status>ok</status>
                <filter-id>nodatabase.com</filter-id>
            </result>
        </get-db>
    </database>
</packet>

However, the getAll method returns one object with empty values (because if ($xmlResult) is always true, even when there are no DBs).

[sibprogrammer]

There is no need for an additional variable if it's used only once on the next line. Just use it: static::$webspace->id

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.49%. Comparing base (a43949f) to head (f57322f).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #188   +/-   ##
=========================================
  Coverage     91.49%   91.49%           
- Complexity      434      436    +2     
=========================================
  Files            83       83           
  Lines          1411     1411           
=========================================
  Hits           1291     1291           
  Misses          120      120           

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