[LMA Regression] Generating documentation with Google Sheets external tables

[brandfocus]

Describe the bug

Generating docs on dbt=0.15.0-b2 with Google Sheets as external tables in BigQuery causes the following error:

Encountered an error:
None is not of type 'string'

Failed validating 'type' in schema['properties']['type']:
    {'type': 'string'}

On instance['type']:
    None

Steps To Reproduce

Please see above

Expected behavior

Documentation is generated

Screenshots and log output

dbt_0.15.0-b2_docs_googlesheets.xlsx

System information

Which database are you using dbt with?

• postgres
• redshift
• bigquery
• snowflake
• other (specify: ____________)

The output of dbt --version:

dbt=0.15.0-b2

The operating system you're using:
Mac OS 10.14.3

The output of python --version:
Python 3.7.4

Additional context

[drewbanin]

Thanks @brandfocus! We'll get this fixed for the next beta release - I appreciate you taking the time to give this a spin :)