add the debug

src/main/java/com/ctrip/fun/admin/service/file/QiniuFileService.java

@@ -54,6 +54,7 @@ public class QiniuFileService {
                     new InetSocketAddress(proxyHost, proxyPort)));
                     new InetSocketAddress(proxyHost, proxyPort)));
         }
         }
         if (multipartFile == null || multipartFile.isEmpty()) {
         if (multipartFile == null || multipartFile.isEmpty()) {
+        	System.out.println("multipartFile is null ");
             logger.error("Qiniu upload error:host:" + proxyHost + ",port:" + proxyPort, "上传文件不能为空");
             logger.error("Qiniu upload error:host:" + proxyHost + ",port:" + proxyPort, "上传文件不能为空");
             return null;
             return null;
         }
         }