Fixed Android 249 - request non json attachment with Header 'Accept: application/json' should return 406

- It seems CBL Android/Java does not set error message in case of error.

Author: hideki

src/main/java/com/couchbase/lite/router/Router.java

@@ -594,6 +594,7 @@ public void start() {
             if (status.getCode() != 0 && status.isSuccessful() == false && connection.getResponseBody() == null) {
                 Map<String, Object> result = new HashMap<String, Object>();
                 result.put("status", status.getCode());
+                result.put("error", status.getHTTPMessage());
                 connection.setResponseBody(new Body(result));
             }