Conditional selection fails silently if not validated

[heggemsnes]

Hi!

I found an issue when using the amazing conditional grab:

// If title is null it fails silently here
const schema = q("*")
  .filter()
  .grab(
    {
      _id: q.string(),
    },
    {
      "type == 'page'": {
        _type: q.literal("page"),
        title: q.string(),
      },
    }
  )

// If title is null the validation fails with an error message
const schema = q("*")
  .filter()
  .grab(
    {
      _id: q.string(),
      title: q.string()
    },
   
  )

Everything works as expected if title is a string as expected, but if it's null the validation fails silently and the parse only returns the _id field.

Would be great if an error message would show up here as well!

[iduuck]

I have the same error, looking into this later and doing a PR, when I find time!

[gksander]

I started this branch a month ago and haven't gotten around to finishing that up, but you might use that as a starting point!