增加流量统计（尚未完善）

app/src/main/java/com/gh/common/util/LoginUtils.java

@@ -137,6 +137,9 @@ public class LoginUtils {
                     @Override
                     public void onFailure(HttpException e) {
                         super.onFailure(e);
+
+                        if (e == null) return;
+
                         ResponseBody responseBody = e.response().errorBody();
                         try {
                             String string = responseBody.string();