Fix fixme on r101177

diff --git a/includes/LocalisationCache.php b/includes/LocalisationCache.php
index 7e650a9..1aaf836 100644 (file)
--- a/includes/LocalisationCache.php
+++ b/includes/LocalisationCache.php
@@ -196,7 +196,7 @@ class LocalisationCache {
         * @return bool
         */
        public function isMergeableKey( $key ) {
-               if ( !isset( $this->mergeableKeys ) ) {
+               if ( $this->mergeableKeys === null ) {
                        $this->mergeableKeys = array_flip( array_merge(
                                self::$mergeableMapKeys,
                                self::$mergeableListKeys,