| Index: trunk/phase3/includes/LocalisationCache.php |
| — | — | @@ -196,7 +196,7 @@ |
| 197 | 197 | * @return bool |
| 198 | 198 | */ |
| 199 | 199 | public function isMergeableKey( $key ) { |
| 200 | | - if ( !isset( $this->mergeableKeys ) ) { |
| | 200 | + if ( $this->mergeableKeys === null ) { |
| 201 | 201 | $this->mergeableKeys = array_flip( array_merge( |
| 202 | 202 | self::$mergeableMapKeys, |
| 203 | 203 | self::$mergeableListKeys, |