Fix return value of wrapAll() when count() is 0

[jakejackson1]

When $this->matches->count() is 0 in QueryMutators::wrapAll() it returns void, but the method is type hinted to return DOMQuery (the current object).

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

If matches is empty and you call ->wrapAll() it will return null.

What is the new behavior?

If matches is empty and you call ->wrapAll() it will return the DOMQuery object, as per the docblock return type.

Does this introduce a breaking change?

• Yes
• No

Included in major release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.45%. Comparing base (86f1c77) to head (a7bebcb).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #44      +/-   ##
============================================
+ Coverage     88.41%   89.45%   +1.04%     
  Complexity     1349     1349              
============================================
  Files            26       26              
  Lines          3124     3036      -88     
============================================
- Hits           2762     2716      -46     
+ Misses          362      320      -42     

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