fix options check

make sure to check if options exists before checking answer

Author: Henrik

src/models/QuestionModel.js

@@ -134,7 +134,7 @@ export default class QuestionModel {
 
     // Check if we have an answer already (when we have a pre-filled form)
     // and set the answered property accordingly
-    if (!this.required && typeof options.answer !== 'undefined') {
+    if (!this.required && options && typeof options.answer !== 'undefined') {
       this.answered = true
     } else if (this.answer && (!this.multiple || this.answer.length)) {
       this.answered = true