Check that nav_block search returns object or throw exception.
Clean up error messages in Page::Navigator.
Add constant to search for C_LINKS using xpath.
Add private method to determine page number from a link tag.
Add logic to extract page number when no nav_last link present.
Use private method to determine page number.
Do not need to keep job links.
Add test setup for page count for single-page, single-post result.
Add test for page count when no nav_last link present.
Add test for page count for a single-page, single-post result.
Add test file for page count for a single-page, single-post result.