Vertical quickNav fix

[mltony]

Link to issue number:

Closes #16387
Closes #16386

Summary of the issue:

Exception when trying to use vertical quickNav in excel browse mode.
Exception when trying to use vertical quickNav on an empty word document.

Description of user facing changes

Fixed exception. Now message "not available" is spoken in excel. In empty word document "no next paratgraph" message is spoken.

Description of development approach

Moved _iterSimilarParagraph() method from BrowseModeTreeInterceptor to BrowseModeDocumentTreeInterceptor class.
Catching RuntimeError coming from MSWord textInfo when calling .collapse().

Testing strategy:

Tested manually on specified test cases.

Known issues with pull request:

N/A

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.