Don't retry when file does not exists, other web ui hangs. (#1748)
Don't retry when file does not exists, other web ui hangs. (#1748)

Fixes hang in
File "python/build_management/revisions.py", line 384, in get_component_revisions_dict
    url_content = _get_url_content(revision_vars_url)
  File "python/build_management/revisions.py", line 185, in _get_url_content
    url_data = storage.read_data(url)
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz