Redundant inference in BuildSQLAgent?

[rafi-rr]

I was going over the inferences that the code performs and my understanding is that there's no point in performing the send_message call below if there was no previous question/SQL.
I can suggest a simple PR to avoid if these values are None.
What do you think?

Open_Data_QnA/agents/BuildSQLAgent.py

Line 128 in 3075ebc

response = chat_session.send_message(build_context_prompt, stream=False)