Cli crashes when no name is provided

[JoseKilo]

HI, nice tool ! Thanks for sharing it.

I've noticed a small bug while using the cli:
If I don't provide a chart name, it crashes without providing much info:

> candlestick-chart -m json-file -f candles.json 
Traceback (most recent call last):
  File "/home/jose/charts/.venv/bin/candlestick-chart", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/jose/charts/.venv/lib/python3.11/site-packages/candlestick_chart/__main__.py", line 59, in main
    chart.draw()
  File "/home/jose/charts/.venv/lib/python3.11/site-packages/candlestick_chart/chart.py", line 57, in draw
    print(self._render())
          ^^^^^^^^^^^^^^
  File "/home/jose/charts/.venv/lib/python3.11/site-packages/candlestick_chart/chart.py", line 53, in _render
    return self.renderer.render(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jose/charts/.venv/lib/python3.11/site-packages/candlestick_chart/chart_renderer.py", line 104, in render
    output.append(chart.info_bar.render(chart_data.main_candle_set, chart_data.width))
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jose/charts/.venv/lib/python3.11/site-packages/candlestick_chart/info_bar.py", line 60, in render
    " | ".join(
TypeError: object of type 'NoneType' has no len()
>

It works if a name is provided:

> candlestick-chart -m json-file -f candles.json --chart-name __NAME__

and even with an empty name:

> candlestick-chart -m json-file -f candles.json --chart-name ''

It looks like the default value for the argument should be a string, changing this line seems to fix it

py-candlestick-chart/src/candlestick_chart/__main__.py

Line 33 in e6a2a0b

parser.add_argument("--chart-name", help="Sets the chart name.")

    parser.add_argument("--chart-name", help="Sets the chart name.", default="")

I'm using the latest version from PyPI:

> candlestick-chart --version
candlestick-chart 2.6.0

[BoboTiG]

Thanks for the report @JoseKilo :)

Would you like to open a PR?

[BoboTiG]

I've some free time, I will work on it, and add tests at the same time.

[BoboTiG]

v2.7.0 released with the fix 🎉

[JoseKilo]

Amazing ! Thanks a lot !!