guide can generate answersets that generate strange errors in DAT

[tobiasnteireho]

It has been observed that in some conditions the viewer can generate answersets that will cause strange errors in the DAT such as

{
    "ok": false,
    "error": "patcher is not a function"
}

and

{
  "ok": false,
  "error": "child \"patches\" fails because [\"patches\" at position 22 fails because [child \"content\" fails because [\"content\" must be a string], child \"type\" fails because [\"type\" must be one of [multiline-text]], child \"type\" fails because [\"type\" must be one of [table-text]], child \"type\" fails because [\"type\" must be one of [checkmark]]]]"
}

This is the viewer counterpart to this issue CCALI/a2jdat#139. Viewer should not be able to generate bad DAT answersets and DAT should not crash on seemingly bad answersets.