Confusing behavior with `cornucopia schema`

[wrapperup]

When running cornucopia schema without any arguments, I expected it to either provide an error or use the schema.sql in the cwd. Instead, I got an error like this in one of the examples, which made me think it was broken:

The error is technically correct, but I thought this was because the example was broken. Could it try using ./schema.sql by default?