Database is not generated with only sqm files

[mattprecious]

Build Environment
SQLDelight version: 1.4.4
OS: Mac
Kotlin version: 1.4.1

Describe the bug

Trying to bootstrap a new server project and using the deriveSchemaFromMigrations approach:

sqldelight {
	Database {
		packageName = 'app.thing.db'
		dialect = "postgresql"
		deriveSchemaFromMigrations = true
	}
}

1.sqm:

CREATE TABLE thing (
  id SERIAL PRIMARY KEY,
);

Database is not generated until I add test.sq:

test:
SELECT *
FROM thing;

Not a big deal as I will have real queries shortly, but it's not immediately obvious what the issue is and I assume this decision was made before deriveSchemaFromMigrations was added.