Templates still require input argument, params alone not enough like docs suggest

I've been following the docs here https://llm.datasette.io/en/stable/templates.html and for me the following hangs:

llm -t recipe -p ingredients 'sausages, milk' -p country Germany

but adding an extra "input" at the end works fine:

llm -t recipe -p ingredients 'sausages, milk' -p country Germany "dinner"

I believe this is due to the fact that a prompt is still waited on from stdin. I am not sure if that is the intended behaviour but the docs suggest that the prompt defined in the template should be sufficient but it's not so perhaps just a small clarification is needed in the docs.

Start with the templates documentation linked in the issue and reproduce both command examples to confirm whether stdin is still expected when only template parameters are supplied. Clarify the intended behavior, then update the relevant documentation so the required command form and the role of the template prompt are unambiguous.