Vertical quickNav fix (#16388)
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().
