When trying to upload a CL which deletes lazy_render.html, I get:

  File "<string>", line 1, in <module>
  File "<string>", line 28, in CheckChangeOnUpload
  File "<string>", line 27, in <genexpr>
  File "/usr/lib/python2.7/genericpath.py", line 54, in getmtime
    return os.stat(filename).st_mtime
OSError: [Errno 2] No such file or directory: 'lazy_render.html'