opensearch fix if user agent had no language

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5233 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/yacysearch.java

@@ -215,6 +215,7 @@ public static serverObjects respond(final httpRequestHeader header, final server
                 String agent = header.get("User-Agent");
                 if (agent == null) agent = System.getProperty("user.language");
                 language = (agent == null) ? "en" : iso639.userAgentLanguageDetection(agent);
+                if (language == null) language = "en";
             }
 
             int maxDistance = (querystring.indexOf('"') >= 0) ? maxDistance = query.length - 1 : Integer.MAX_VALUE;