posts_nav_link ignoring blank function parameters

[milanmk]

posts_nav_link shows both next and previous links including link seperator even though the respective function parameters are blank.

<div id="page-nav-prev"><?php posts_nav_link('', '&#171; Previous Page', '') ?></div>
<div id="page-nav-next"><?php posts_nav_link('', '', 'Next Page &#187;') ?></div>

[Denis-de-Bernardy]

see #10204

[jeremyclark13]

A workaround for now is to set the paramaters to a blank space.

<?php posts_nav_link(' ',' ','&laquo; Older Entries') ?>
<?php posts_nav_link(' ','Newer Entries &raquo;',' ') ?>

[chollaball]

Issue still occurs in v 3.0. Did not occur in v 2.7. I would classify as a bug not an enhancement since it used to work. Workaround as described above is still valid.

[nikolov.tmw]

Removes array_filter(), which preserves the arguments even when they are empty.

[nikolov.tmw]

I've attached a patch that fixes the issue. However I see a problem with backwards-compatibility in that approach(which was to just remove array_filter()).

Thinking about it, I'm not sure if there's a good backwards-compatible fix for that issue.

[wonderboymusic]

These functions are unused by core, there is no use writing a bunch of hairy logic for them to ensure BC.