fix: regard question as completed if not required

Author: mbastian93

src/stores/questionnaire.ts

@@ -93,7 +93,9 @@ const storeBuilder = ({ optionalPersistor }: Services) => {
     }
 
     get isCompleted() {
-      return this.questions.filter(({ isEnabled }) => isEnabled).every(({ isAnswered }) => isAnswered);
+      return this.questions
+        .filter(({ isEnabled }) => isEnabled)
+        .every(({ isAnswered, required }) => isAnswered || !required);
     }
 
     get isPristine() {