Improved message when CL description is missing

presubmit_canned_checks.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 import os as _os
 _HERE = _os.path.dirname(_os.path.abspath(__file__))
 
 
@@ skipping 43 matching lines @@
         keyword + ' is present in the changelist description.')]
   else:
     return []
 
 
 def CheckChangeHasDescription(input_api, output_api):
   """Checks the CL description is not empty."""
   text = input_api.change.DescriptionText()
   if text.strip() == '':
     if input_api.is_committing:
-      return [output_api.PresubmitError('Add a description.')]
+      return [output_api.PresubmitError('Add a description to the CL.')]
     else:
-      return [output_api.PresubmitNotifyResult('Add a description.')]
+      return [output_api.PresubmitNotifyResult('Add a description to the CL.')]
   return []
 
 
 def CheckChangeWasUploaded(input_api, output_api):
   """Checks that the issue was uploaded before committing."""
   if input_api.is_committing and not input_api.change.issue:
     return [output_api.PresubmitError(
       'Issue wasn\'t uploaded. Please upload first.')]
   return []
 
@@ skipping 1017 matching lines @@
 def CheckPatchFormatted(input_api, output_api):
   import git_cl
   cmd = ['cl', 'format', '--dry-run', input_api.PresubmitLocalPath()]
   code, _ = git_cl.RunGitWithCode(cmd, suppress_stderr=True)
   if code == 2:
     return [output_api.PresubmitPromptWarning(
       'Your patch is not formatted, please run git cl format.')]
   # As this is just a warning, ignore all other errors if the user
   # happens to have a broken clang-format, doesn't use git, etc etc.
   return []