Ticket #1912: zero-postmeta-value.diff

admin-functions.php

@@ -875 +875 @@
         $metakeyinput = $wpdb->escape(stripslashes(trim($_POST['metakeyinput'])));
         $metavalue = $wpdb->escape(stripslashes(trim($_POST['metavalue'])));
 
-        if (!empty ($metavalue) && ((('#NONE#' != $metakeyselect) && !empty ($metakeyselect)) || !empty ($metakeyinput))) {
+        if ( ('0' === $metavalue || !empty ($metavalue)) && ((('#NONE#' != $metakeyselect) && !empty ($metakeyselect)) || !empty ($metakeyinput))) {
                 // We have a key/value pair. If both the select and the 
                 // input for the key have data, the input takes precedence: