fix possible nil

weed/operation/upload_content.go

@@ -120,10 +120,12 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 		}, filename, contentIsGzipped, mtype, pairMap, jwt)
 	}
 
+	if uploadResult != nil {
 		uploadResult.Size = uint32(clearDataLen)
 		if contentIsGzipped {
 			uploadResult.Gzip = 1
 		}
+	}
 
 	return uploadResult, err
 }