Adjust tree view if null database (spark)

[jtcohen6]

On Spark, where database is always null, the Database tree view looks like:

Suggestions from @dallyhorton, who initially surfaced this in Slack:

I would suggest just using the name of the project in place of the null. Better still, do we need a root node? It just mean one less click to expand the list of schemas. If we need the root node, could we default the tree to expanded (instead of collapsed)?

[markdessain]

Had the same issue and was pointed in this direction. Not had time to look at the underlying code but a quick fix / workaround is to run the following after generating the documentation:

sed 's/"database": null/"database": "<DATABASE_NAME>"/g' ./target/manifest.json

[github-actions]

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