10328 git pbchk falls over with no changesets

*** 123,133 ****
      p = git(["for-each-ref", "--format=%(refname:short) %(upstream:short)",
              "refs/heads/"])
  
      if not p:
          sys.stderr.write("Failed finding git parent branch\n")
!         sys.exit(err)
  
      for line in p:
          # Git 1.7 will leave a ' ' trailing any non-tracking branch
          if ' ' in line and not line.endswith(' \n'):
              local, remote = line.split()
--- 123,133 ----
      p = git(["for-each-ref", "--format=%(refname:short) %(upstream:short)",
              "refs/heads/"])
  
      if not p:
          sys.stderr.write("Failed finding git parent branch\n")
!         sys.exit(1)
  
      for line in p:
          # Git 1.7 will leave a ' ' trailing any non-tracking branch
          if ' ' in line and not line.endswith(' \n'):
              local, remote = line.split()
*** 139,150 ****
      """Return a list of any checkin comments on this git branch"""
  
      p = git('log --pretty=tformat:%%B:SEP: %s..' % parent)
  
      if not p:
!         sys.stderr.write("Failed getting git comments\n")
!         sys.exit(err)
  
      return [x.strip() for x in p if x != ':SEP:\n']
  
  def git_file_list(parent, paths=None):
      """Return the set of files which have ever changed on this branch.
--- 139,150 ----
      """Return a list of any checkin comments on this git branch"""
  
      p = git('log --pretty=tformat:%%B:SEP: %s..' % parent)
  
      if not p:
!         sys.stderr.write("No outgoing changesets found - missing -p option?\n");
!         sys.exit(1)
  
      return [x.strip() for x in p if x != ':SEP:\n']
  
  def git_file_list(parent, paths=None):
      """Return the set of files which have ever changed on this branch.
*** 155,165 ****
      p = git("log --name-only --pretty=format: %s.. %s" %
               (parent, ' '.join(paths)))
  
      if not p:
          sys.stderr.write("Failed building file-list from git\n")
!         sys.exit(err)
  
      ret = set()
      for fname in p:
          if fname and not fname.isspace() and fname not in ret:
              ret.add(fname.strip())
--- 155,165 ----
      p = git("log --name-only --pretty=format: %s.. %s" %
               (parent, ' '.join(paths)))
  
      if not p:
          sys.stderr.write("Failed building file-list from git\n")
!         sys.exit(1)
  
      ret = set()
      for fname in p:
          if fname and not fname.isspace() and fname not in ret:
              ret.add(fname.strip())