Description of the bug:

When passing empty message to ChatSession.send_message it triggers a 500 Internal Server Error.

Here is an example :

import google.generativeai as genai

genai.configure(api_key ="YOUR API KEY")

model = genai.GenerativeModel(model_name='gemini-pro')

chat = model.start_chat(history=[])
response = chat.send_message("")

Actual vs expected behavior:

Actual behavior:

InternalServerError: 500 POST https://dp.kaggle.net/palmapi/v1beta/models/gemini-pro:generateContent?%24alt=json%3Benum-encoding%3Dint: An internal error has occurred. Please retry or report in https://developers.generativeai.google/guide/troubleshooting

Actual behavior:
Should be handled in the same way as it is in GenerativeModel.generate_content :

TypeError: contents must not be empty

Any other information you'd like to share?

No response