fix: display recipes without metadata in the recipe list in ui

[lifeizhou-ap]

Fix issue below

This recipe is in ~/.config/goose/recipes/test-recipe.yaml

recipe:
  title: test recipe again
  description: testing recipe again
  instructions: The value of test_param is {{test_param}}
  prompt: What is the value of test_param?
  parameters:
    - key: test_param
      input_type: string
      requirement: required
      description: Enter value for test_param

Expected: This recipe should be shown in the recipe list in UI.
Actual: it is not shown

[michaelneale]

seems sensible but haven't manually tested it.