modules/bus: prevent throwing XML exception when receving invalid HTML from efa

modules/bus.js

@@ -26,7 +26,10 @@ function pad(n, width, z) {
 function fetchData(stop, cb) {
     url = "http://mobil.efa.de/mobile3/XSLT_DM_REQUEST?outputFormat=XML&useAllStops=1&useRealtime=1&maxAssignedStops=1&itOptionsActive=1&trITMOTvalue100=5&itdLPxx_dest=&sessionID=0&language=en&locationServerActive=1&mode=direct&limit=60&itdLPxx_script=true&type_dm=stop&placeInfo_dm="+CITY+"&name_dm="+stop;
     httpreq.get(url, {binary: true}, function (err, res) {
-        cb(XML.parse(iconv.decode(res.body, 'latin1')));
+        try {
+            cb(XML.parse(iconv.decode(res.body, 'latin1')));
+        } catch(e) {
+        }
     });
 }