🚑 (results) Fix results display when variable has null value

apps/viewer/src/components/TypebotPage.tsx

@@ -1,11 +1,5 @@
 import { TypebotViewer } from 'bot-engine'
-import {
-  Answer,
-  AnswerInput,
-  PublicTypebot,
-  Typebot,
-  VariableWithValue,
-} from 'models'
+import { AnswerInput, PublicTypebot, Typebot, VariableWithValue } from 'models'
 import { useRouter } from 'next/router'
 import React, { useEffect, useState } from 'react'
 import { isDefined, isNotDefined } from 'utils'