better error message if directory is not found

go/weed/upload.go

@@ -125,6 +125,7 @@ func runUpload(cmd *Command, args []string) bool {
 			return false
 		}
 		filepath.Walk(*uploadDir, func(path string, info os.FileInfo, err error) error {
+			if err == nil {
 				if !info.IsDir() {
 					results, e := submit([]string{path})
 					bytes, _ := json.Marshal(results)
@@ -133,6 +134,9 @@ func runUpload(cmd *Command, args []string) bool {
 						return e
 					}
 				}
+			} else {
+				fmt.Println(err)
+			}
 			return err
 		})
 	} else {