fixed bug in query '0'

SE/se-lib/SqlQueryWhereBuilder.php

@@ -342,7 +342,7 @@ class SqlQueryWhereBuilder {
 		$sqlSearchWords = array();
 		if (!empty($searchWords)) {
 			foreach ($searchWords as $word) {
-				if (!empty($word)) {
+				if (!empty($word) || '0' === $word) {
 					$sqlSearchWords[] = $word;
 				}
 			}