Fix error when getting parents() for HTML elements

[super-dm3]

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?

• Calling parents() on HTML elements throws error
• Calling parent() on HTML root element throws error

What is the new behavior?

• No errors when calling parents()
• parent() on root element returns empty match

Does this introduce a breaking change?

• Yes
• No

Other information

Also, parent() and parent() logic were merged to getParentElements() to avoid duplication of code/logic. This is an optional suggestion. The primary fix is only one additional check in both these functions: "while ($m->parentNode && ..."

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.34%. Comparing base (f150006) to head (88db7da).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #61      +/-   ##
============================================
+ Coverage     89.30%   89.34%   +0.04%     
+ Complexity     1349     1340       -9     
============================================
  Files            26       26              
  Lines          3132     3003     -129     
============================================
- Hits           2797     2683     -114     
+ Misses          335      320      -15     

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[jakejackson1]

Looks good. While testing I found a separate bug #62, but it looks related to the is() functionality and will handle separately.