In HTML5, the action attribute is no longer required. Remove this attribute when empty.

The admin HTML is served with the HTML5 doctype.

"The action and formaction content attributes, if specified, must have a value that is a valid non-empty URL potentially surrounded by spaces." 
http://www.w3.org/html/wg/drafts/html/master/forms.html#attr-fs-action

Props voldemortensen.
Fixes #30126.


git-svn-id: https://develop.svn.wordpress.org/trunk@31200 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/plugins.php

@@ -456,11 +456,11 @@ do_action( 'pre_current_active_plugins', $plugins['all'] );
 
 <?php $wp_list_table->views(); ?>
 
-<form method="get" action="">
+<form method="get">
 <?php $wp_list_table->search_box( __( 'Search Installed Plugins' ), 'plugin' ); ?>
 </form>
 
-<form method="post" action="">
+<form method="post">
 
 <input type="hidden" name="plugin_status" value="<?php echo esc_attr($status) ?>" />
 <input type="hidden" name="paged" value="<?php echo esc_attr($page) ?>" />