Fixes for {ifprofile_field_...} tag.

- Now correctly respects visibility of hidden fields setting.
- Now removes tag and text if custom field contains 0 or is empty.

filter.php

@@ -1812,15 +1812,15 @@ function ($matches) {
 
                     // If the tag exists and is not set to "Not visible" in the custom profile field's settings.
                     if (isset($profiledata[$field->id]) && $isuser &&
-                            ($field->visible == '0' || get_config('filter_filtercodes', 'ifprofilefiedonlyvisible'))) {
+                            ($field->visible == '0' || !get_config('filter_filtercodes', 'ifprofilefiedonlyvisible'))) {
                         $data = trim($profiledata[$field->id]);
                     } else {
                         $data = '';
                     }
 
                     // If the value is empty or zero, remove the all of the tags and their contents for that field shortname.
                     if (empty($data)) {
-                        $replace['/\{ ' . $tag . '(.*?)\}(.*?)\{\/' . $tag . '\}/ims'] = '';
+                        $replace['/\{' . $tag . '(.*?)\}(.*?)\{\/' . $tag . '\}/ims'] = '';
                         continue;
                     }