onError hook not called when an error occurs during streaming in useAssistant

[vinayakakv]

Description

The useAssistant hook exposes error state and an onError hook that is called whenever an error happens.

However, when an error happens during streaming, only error gets set; onError is not called.

We are using onError hook to set custom error state, which is cleared on reload. Thus, it would be good to have:

1. onError being called on stream errors
2. clearError returned as a hook value that makes the reload process easier.

Code example

No response

Additional context

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