While generating promgen I see following error, I verified the site.yaml for empty documents and I found and some, after fixing them also I see the same error.

+ gen_bundle

++ pwd

+ docker run --env http_proxy=http://one.proxy.att.com:8888/ --env https_proxy=http://one.proxy.att.com:8888/ --user 0 --rm -t -w /target -v /root/yaml_builds:/target quay.io/airshipit/promenade:009f3de7ecf6afcdd2783ac7a12470394d7dfab3 promenade build-all --validators -o /target/tars/dellgen10/configs/promenade-bundle '/target/tars/dellgen10/configs/promenade/*.yaml'

+ PORT=9000

+ UWSGI_TIMEOUT=300

+ PROMENADE_THREADS=1

+ PROMENADE_WORKERS=4

+ '[' promenade = server ']'

+ exec promenade build-all --validators -o /target/tars/dellgen10/configs/promenade-bundle /target/tars/dellgen10/configs/promenade/global.yaml /target/tars/dellgen10/configs/promenade/site.yaml

2018-08-22 19:03:15,525 INFO     - - - promenade.config:from_streams [ 55] Loading documents from /target/tars/dellgen10/configs/promenade/global.yaml

2018-08-22 19:03:22,244 INFO     - - - promenade.config:from_streams [ 59] Successfully loaded 173 documents from /target/tars/dellgen10/configs/promenade/global.yaml

2018-08-22 19:03:22,245 INFO     - - - promenade.config:from_streams [ 55] Loading documents from /target/tars/dellgen10/configs/promenade/site.yaml

2018-08-22 19:03:24,975 INFO     - - - promenade.config:from_streams [ 59] Successfully loaded 120 documents from /target/tars/dellgen10/configs/promenade/site.yaml

2018-08-22 19:03:24,975 INFO     - - - promenade.config:__init__ [ 24] Parsing document schemas.

Traceback (most recent call last):

  File "/usr/local/bin/promenade", line 11, in <module>

    load_entry_point('promenade', 'console_scripts', 'promenade')()

  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__

    return self.main(*args, **kwargs)

  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main

    rv = self.invoke(ctx)

  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke

    return _process_result(sub_ctx.command.invoke(sub_ctx))

  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke

    return ctx.invoke(self.callback, **ctx.params)

  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke

    return callback(*args, **kwargs)

  File "/opt/promenade/promenade/cli.py", line 42, in build_all

    streams=config_files)

  File "/opt/promenade/promenade/config.py", line 62, in from_streams

    return cls(documents=documents, **kwargs)

  File "/opt/promenade/promenade/config.py", line 25, in __init__

    schema_set = validation.load_schemas_from_docs(documents)

  File "/opt/promenade/promenade/validation.py", line 95, in load_schemas_from_docs

    if document.get('schema', '') == SCHEMA_SCHEMA:

AttributeError: 'NoneType' object has no attribute 'get'