Remove redundant message in case "git cl split" fails upload

This CL stops "git cl split" from printing which directories could
not be uploaded if upload fails. This information is redundant with
previous lines printed by "git cl split"

Bug:None

Change-Id: I39bc47e3b29d4ce777a65b6bdac28b19b672339f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4743774
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>

split_cl.py

@@ -155,8 +155,7 @@ def UploadCl(refactor_branch, refactor_branch_upstream, directories, files,
 
   ret = cmd_upload(upload_args)
   if ret != 0:
-    print('Uploading failed for ' + FormatDirectoriesForPrinting(directories) +
-          '.')
+    print('Uploading failed.')
     print('Note: git cl split has built-in resume capabilities.')
     print('Delete ' + git.current_branch() +
           ' then run git cl split again to resume uploading.')