Don't print markup in _s_content_nav() when it is not needed. Fixes #28.
Don't print markup in _s_content_nav() when it is not needed. Fixes #28.

Added checks for previous (or parent) and next post in _s_content_nav() before printing any navigation-specific markup. Same approach for when using the function to print pagination links on a posts set for less than two pages.

madeso-uk/vcsassist,andbaz/launchbaz,carl-alberto/business-portfolio,solidusjs/wp-solidus,jchck/jchck_,vaishaliagola27/_s,vaishaliagola27/_s,SparkartGroupInc/nadando,vaishaliagola27/_s,madeso-uk/vcsassist,jchck/jchck_,carl-alberto/business-portfolio,andbaz/launchbaz