[Bug] The line is not displayed on the graph, for the SVG rendering mode

[twin720]

Version

5.5.1

Link to Minimal Reproduction

https://echarts.apache.org/examples/en/editor.html?renderer=svg&code=PYBwLglsB2AEC8sDeBYAULTsBEAPAgrhAM7YBcy6W1OYAniAKbk4DGAhmIwObABOdbABoqWAL4iMWbHUIkWqKTVoNmFbADd2AGwCuzSdQmjM2Yoz4RGpCgG0TNRcuUATTuzsPnWWwHJ82iAAFuy-QrAATAC6ht40fgHBoeEADDFecQmBIWGw0Lra2ulKcZhZSblpsaVl_tnJsACMxTU-dRWpLa2wfgBCfOwawLnN1TV-AMIhfNpWufmFXa1-ACKM2mANjWkZyktx2PRMLNiz0Aa7NGYAtsDAYEEsYHz6Y97YrDDnrGAAcgXaGywZ6vS5iBzFMQAbiAA

Steps to Reproduce

1. Open link example or open Offical Editor, select Render SVG
   
   and type code:

option = {
    "xAxis": {
        "type": "category",
    },
    "yAxis": {
        "type": "value",
    },
    "series": [
        {
            data: [
              ['Alpha', 2],
              ['Alpha', 0],
              ['Alpha', null],
              ['Alpha', 0],
              ['Alpha', 1],
              ['Alpha', 0],
              ['Bravo', 1],
              ['Charlie', null],
              ['Delta', 10]
            ],
            "type": "line",
            "smooth": true,
            "connectNulls": true,
        }
    ],
};

3. Make sure the graph line is not displayed.
   

Current Behavior

the graph line is NOT displayed for SVG rendering mode

Expected Behavior

the graph line is displayed for SVG rendering mode

Environment

- OS: Windows 10 Pro 22H2 19045.2486
- Browser:
Chrome 127.0.6533.120 (64 bit)
Firefox 129.0.1 (64 bit)
- Framework: -

Any additional comments?

Please note that the error is reproduced only for SVG rendering mode! For CANVAS rendering mode the line on the graph is displayed normally.

[helgasoft]

gosh, how do you find this stuff ?!
It's a bug in the first data point for SVG line - does not like a null mixed with other values.
['Alpha', null] is the culprit, other values like ['Bravo', null] would be ok - Demo