fix possible nil

weed/operation/upload_content.go

@@ -120,9 +120,11 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 		}, filename, contentIsGzipped, mtype, pairMap, jwt)
 	}
 
-	uploadResult.Size = uint32(clearDataLen)
-	if contentIsGzipped {
-		uploadResult.Gzip = 1
+	if uploadResult != nil {
+		uploadResult.Size = uint32(clearDataLen)
+		if contentIsGzipped {
+			uploadResult.Gzip = 1
+		}
 	}
 
 	return uploadResult, err