Wrong font size with blank bullet list

[schwindt]

A blank bullet list leads to an incorrect font size.

Checklist

• [x] I can reproduce this issue with a vanilla SwiftUI project.
• [x] I can reproduce this issue using the main branch of this package.
• [x] This bug hasn't been addressed in an existing GitHub issue.

Steps to reproduce Explanation of how to reproduce the incorrect behavior. This could include an attached project, a link to code, or a Markdown-formatted text exhibiting the issue.

1. try to preview this markdown string:
2. "**Banana**:\n - oink", this one behaves correctly
3. try this string: "**Banana**:\n - "
4. In this case the word Banana will be written with much bigger font size

Expected behavior It should be the same font size

Screenshots

Version information

• MarkdownUI: 2.3.1
• OS: iOS 17.5
• Xcode: 15.0