AlvaroGuGo303

[Bug] Slider dataZoom xAxis is invalid when 1 single data is represented on line echart

2

### Version 6.0.0 ### Link to Minimal Reproduction [Demo](https://echarts.apache.org/examples/en/editor.html?c=line-simple&code=VVHLasMwELz7K-amFowfeTk4pNBLbzm1UGjIQY3VRDSRgi0TG-N_765VQ3zR7uyOVprZOEYhnfyy9orqogtV4rs-4X5WBpU2p4sa-rhZbRysgdNXBdnoKmiO2KILANfeVA5xlE6dbNmKkGp8Kcde7KwRIcRHrTh8qmJA55rDW6k5vEs3hNqIQ9BvgsZN5_KLjzMpA9JstZjPs8ViliRJOMLlFK6mMJvCtYeP43yJKsNHBuFb7NNZctggjkNQl64v6VhzljFK-Zh7Bl7Sf6futvytgsDenCbTvJ7mlWzL0bgQzCX_PAtofafDVTY5dtKdI8qeoijiPzyjH-Xznpj3oy9OlTtbsEHGGiU8p1KlVjRp343uVbQWopLDg5yelf0B&enc=deflate) (provided by [helgasoft](https://github.com/helgasoft)) ### Steps to Reproduce I've attached the entire EChartsOption object and el element and sizes for both cases:...