⚡ Improve old engine bubbles display robustness

packages/bot-engine/src/components/ChatGroup/ChatBlock/bubbles/HostBubble.tsx

@@ -4,7 +4,6 @@ import { ImageBubble } from '@/features/blocks/bubbles/image'
 import { TextBubble } from '@/features/blocks/bubbles/textBubble'
 import { VideoBubble } from '@/features/blocks/bubbles/video'
 import { BubbleBlock, BubbleBlockType } from 'models'
-import React from 'react'
 
 type Props = {
   block: BubbleBlock

packages/bot-engine/src/components/ChatGroup/ChatGroup.tsx

@@ -307,7 +307,7 @@ const ChatChunks = ({
           unmountOnExit
           in={isDefined(input)}
         >
-          {input && (
+          {input ? (
             <InputChatBlock
               block={input}
               onTransitionEnd={onDisplayNextBlock}
@@ -315,6 +315,8 @@ const ChatChunks = ({
               hasAvatar={hostAvatar.isEnabled}
               hasGuestAvatar={hasGuestAvatar}
             />
+          ) : (
+            <div />
           )}
         </CSSTransition>
       )}