Better handle homebridge errors

src/widgets/homebridge/proxy.js

@@ -64,6 +64,7 @@ async function apiCall(widget, endpoint, service) {
 
   if (status !== 200) {
     logger.error("Error getting data from Homebridge: %s status %d. Data: %s", url, status, data);
+    return { status, contentType, data: null, responseHeaders };
   }
 
   return { status, contentType, data: JSON.parse(data.toString()), responseHeaders };