[I] [Bug] Gradient color rendered as black in VisualMap [echarts]

[via GitHub]

zukilover opened a new issue, #19700:
URL: https://github.com/apache/echarts/issues/19700

   ### Version
   
   5.5.0
   
   ### Link to Minimal Reproduction
   
   https://echarts.apache.org/examples/en/editor.html?c=map-usa-projection
   
   ### Steps to Reproduce
   
   Given the example at 
https://echarts.apache.org/examples/en/editor.html?c=map-usa-projection, add 
`visualMap.inRange.color` a gradient value:
   
   ```
   {
               type: 'linear',
               x: 0,
               y: 0,
               x2: 0,
               y2: 1,
               colorStops: [{
                   offset: 0, color: 'red' // color at 0%
               }, {
                   offset: 1, color: 'blue' // color at 100%
               }],
               global: false // default is false
             },
   ```
   
   it renders as shown below:
   ![USA Population Estimates 
(2012)](https://github.com/apache/echarts/assets/371291/b448556f-f894-44a4-9aed-b9ed1b233013)
   
   
   
   ### Current Behavior
   
   Gradient is rendered as black.
   
   ### Expected Behavior
   
   Gradient is rendered correctly.
   
   ### Environment
   
   ```markdown
   - OS: MacOS 13.2.1
   - Browser: Google Chrome Version 122.0.6261.112 (Official Build) (arm64)
   - Framework: N/A
   ```
   
   
   ### Any additional comments?
   
   _No response_


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