dbt test fails with store_failures using Databricks (0.21)

[ferdyh]

I'm running dbt-core / dbt-spark 0.21 and when I use store_failures i encounter the following error:

Compilation Error in test dummy (tests/dummy.sql)
  Invalid value provided for 'persist_docs'. Expected dict but got value: None
  
  > in macro comment_clause (macros/adapters.sql)
  > called by macro spark__create_table_as (macros/adapters.sql)
  > called by macro create_table_as (macros/adapters/common.sql)
  > called by macro statement (macros/core.sql)
  > called by macro materialization_test_default (macros/materializations/dummy.sql)
  > called by test dummy (tests/dummy.sql)

In 0.20 this works fine.

[ferdyh]

dbt-spark issue, and apparently fixed

[jtcohen6]

For posterity: dbt-labs/dbt-spark#232