chore: fixed a bug caused by updating the chat SDK to version 4.16.0.

Author: OnestarLee

packages/uikit-react-native/src/components/GroupChannelMessageRenderer/index.tsx

@@ -185,7 +185,7 @@ const GroupChannelMessageRenderer: GroupChannelProps['Fragment']['renderMessage'
       if (
         mentionManager.shouldUseMentionedMessageTemplate(message, sbOptions.uikit.groupChannel.channel.enableMention)
       ) {
-        return message.mentionedMessageTemplate;
+        return message.mentionedMessageTemplate ?? '';
       } else {
         return message.message;
       }

packages/uikit-react-native/src/components/ThreadParentMessageRenderer/index.tsx

@@ -111,7 +111,7 @@ const ThreadParentMessageRenderer = (props: ThreadParentMessageRendererProps) =>
       if (
         mentionManager.shouldUseMentionedMessageTemplate(message, sbOptions.uikit.groupChannel.channel.enableMention)
       ) {
-        return message.mentionedMessageTemplate;
+        return message.mentionedMessageTemplate ?? '';
       } else {
         return message.message;
       }