questions.yml file expected when label is NULL

[saudiwin]

Bug description

When the sd_question function is called, the default for label is NULL. However, if label is NULL, the sd_question function will expect there to be a local questions.yml file with a full question description.

However, this means that you can't programatically define a question without a label -- which seems like a reasonable use case. It seems like testing for only a missing label might be fairly restrictive to the user. Also, it would be nice if the error message were more informative -- I was confused initially because there is a questions.yml file, just not a local questions.yml file. I.e., it might be good to provide an error message that informs the user what they are missing (enough info in the sd_question call).

Steps to reproduce

sd_question(
      type   = 'matrix',
      id     = "regime",
      row  = c("Fish","Dog"),
      option = c("One","Two")
    )

Expected behavior

No response

Actual behavior

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Your environment

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