[backend] Validated to prevent saving empty messages

[lim396]

• backend側で中身が空のメッセージを保存できるようになってしまっていたため、保存できないように修正しました。

[coderabbitai]

Walkthrough

This update introduces a validation step in the ChatGateway class to prevent the processing of empty messages. It ensures that any message with no content is immediately identified, logged as an error, and not processed further. This change enhances the robustness of the chat system by avoiding unnecessary processing of invalid messages.

Changes

File	Change Summary
backend/src/chat/chat.gateway.ts	Added a check to halt processing of messages if data.content is empty.

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