[CT-1980] Welcome message not shown in dbt docs

[halvorlu]

Describe the bug

The overview page of dbt docs shows "(loading)" instead of the welcome message. There is an error in the console: "TypeError: Cannot read properties of undefined (reading 'block_contents')"

Steps To Reproduce

Run dbt init, dbt docs generate and dbt docs serve with dbt version 1.4.

Expected behavior

Expected to see the default welcome message on the overview page of dbt docs.

Screenshots and log output

The output of dbt --version:

Core:
  - installed: 1.4.1
  - latest:    1.4.1 - Up to date!

Plugins:
  - bigquery: 1.4.0 - Up to date!

[halvorlu]

I believe this is due to a new path for dbt.__overview__ in manifest.json, which is now doc.dbt.__overview__ in dbt 1.4.

[jtcohen6]

@halvorlu Thanks for opening, and diagnosing! This should be a quick fix. I opened a corresponding issue in dbt-core (dbt-labs/dbt-core#6801) just to track this as a v1.4 regression that we should include in v1.4.x patch release