All: remove check of possibly undefined global variable

- this throws an error whenever WPLANG is not defined globally.
  I don't think it's needed because it already has a sensible fallback
  and we can set it in options tables if necessary

Author: timmywil

mu-plugins/relevanssi/lib/stopwords.php

@@ -5,9 +5,6 @@ function relevanssi_populate_stopwords() {
 	global $wpdb, $relevanssi_variables;
 
 	$lang = get_option('WPLANG');
-	if (empty($lang) && WPLANG != '') {
-		$lang = WPLANG;
-	}
 	if (empty($lang)) $lang = "en_GB";
 
 	if (file_exists($relevanssi_variables['plugin_dir'] . 'stopwords/stopwords.' . $lang)) {