yarn run create_dist failing

[RyanJarv]

Description

create_dist does not work

Steps to Reproduce

1. run yarn run create_dist

Actual result:

$ yarn create_dist
yarn run v1.6.0
$ node ./scripts/commands.js create_dist
update branding...
gn gen <redacted>/src/out/Release --args="root_extra_deps=[\"//brave\"] is_component_build=false proprietary_codecs=true ffmpeg_branding=\"Chrome\" enable_nacl=false enable_widevine=true target_cpu=\"x64\" is_official_build=true is_debug=false dcheck_always_on=false brave_channel=undefined brave_google_api_key=\"AIzaSyAQfxPJiounkhOjODEO5ZieffeBv6yft2Q\" brave_google_api_endpoint=\"https://www.googleapis.com/geolocation/v1/geolocate?key=\" brave_product_name=\"Brave\" brave_project_name=\"brave\" brave_version_major=\"1\" brave_version_minor=\"0\" brave_version_build=\"0\" mac_signing_identifier=\"\" cc_wrapper=\"<redacted>/src/brave/script/redirect-cc.py\" "
ERROR at the command-line "--args":1:234: Undefined identifier
root_extra_deps=["//brave"] is_component_build=false proprietary_codecs=true ffmpeg_branding="Chrome" enable_nacl=false enable_widevine=true target_cpu="x64" is_official_build=true is_debug=false dcheck_always_on=false brave_channel=undefined brave_google_api_key="AIzaSyAQfxPJiounkhOjODEO5ZieffeBv6yft2Q" brave_google_api_endpoint="https://www.googleapis.com/geolocation/v1/geolocate?key=" brave_product_name="Brave" brave_project_name="brave" brave_version_major="1" brave_version_minor="0" brave_version_build="0" mac_signing_identifier="" cc_wrapper="<redacted>/src/brave/script/redirect-cc.py"
                                                                                                                                                                                                                                         ^--------
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error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Reproduces how often:

Always

Brave version (about:brave info)

current master branch

Additional Information

This is caused by the brave_channel=undefined in the gn gen command.