Enhanced Time Axis Label Handling for ECharts --- Fix #19737

[WZY009]

This test case addresses the issue where the time axis in ECharts incorrectly generates labels for series with no data, resulting in misleading visual indications on the graph. The should generate correct labels for time axis with non-empty data series test ensures that labels are correctly generated for time axes with valid data points, verifying that the date range is accurately represented. Conversely, the should not generate labels for empty data series on a time axis test confirms that no labels are produced when the data series is empty, preserving the integrity of the axis range. This improvement is essential for maintaining accurate data representation, particularly in dynamic charts where data streams might intermittently have empty series.

[echarts-bot[bot]]

Thanks for your contribution! The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

To reviewers: If this PR is going to be described in the changelog in the future release, please make sure this PR has one of the following labels: PR: doc ready, PR: awaiting doc, PR: doc unchanged

This message is shown because the PR description doesn't contain the document related template.