retriever condition improve for better response

[JisanAR03]

The changes are very small, but we need them. Now our bot will respond more effectively. I was researching the chain and the vector retrieval part for a few hours. For now, they are fine to use.

@DonnieBLT , can you please this PR for merging

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: website/bot.py

Function	Unhandled Issue
conversation_chain	AttributeError: 'NoneType' object has no attribute 'as_retriever' /api/chat... Event Count: 7

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[arkid15r]

It's still hard to tell what's k. Is it a limit for search results number?

LGTM

[JisanAR03]

It's still hard to tell what's k. Is it a limit for search results number?
LGTM

@arkid15r , it's actually the retrieval result amount from vector database based on the user question

[DonnieBLT]

looks straightforward so approving

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ AttributeError: 'NoneType' object has no attribute 'as_retriever' /api/chatbot/conversation/ View Issue

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