Empty markdown cell during time to first token in adisplay_stream

[adrische]

Hi,
in

async def adisplay_stream(rs, chat=None, mx=2000):
    "Use IPython.display to markdown display the response stream, refreshing from `chat.full()` on `Refresh`."
    try: from IPython.display import display, Markdown
    except ModuleNotFoundError: raise ModuleNotFoundError("This function requires ipython. Please run `pip install ipython` to use.")
    acc,h = StreamAccum(chat, mx=mx), display(Markdown(' '), display_id=True)
    async for o in rs:
        if acc(o) and acc.txt: h.update(Markdown(acc.txt))
    return acc.txt

h is initialized before the stream starts, leading to an empty Markdown cell being displayed while waiting for the first token.
If desired, this could be circumvented for example by initializing h=None at first, and then only creating h in the first loop iteration.