A user selects the model they want to chat to. On a page refresh or change the system changes the model selected back to the Granite 7B model. I was using a different one and did not expect this behaviour and therefore the API calls to the chat server were incorrect.

To address this I have:

1. Stopped the first model in the drop down list being selected by default on page load. The model selector now has no model selected.
2. If a user tries to submit a query with no model selected then an error message appears to communicate this.
3. When the user selects the model they desire the error message clears.

I have noticed that the empty prompt in a request is not communicated to the user. I will deal with this in -> #78

Fixes #53