[Bug] If only the subtitle is set in the title and the main title is not set, a layout error will occur.

[xuefei1313]

Version

2.0.13

Link to Minimal Reproduction

https://www.visactor.com/vchart/playground?specId=4516094936&timestamp=1767773022168&version=2.0.12&theme=light

Steps to Reproduce

Current Behavior

Expected Behavior

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response

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Title: [Bug] If only the subtitle is set in the title and the main title is not set, a layout error will occur.