Add check in splitCells to prevent calling trim on undefined

[zbialecki]

Marked version: 4.0.11
Markdown flavor: GitHub Flavored Markdown

Description

Fixes #2371

Expectation

With this change I expect the example given in the issue to not cause a JavaScript error.

Result

The test case no longer throws an error and instead renders the table properly.

What was attempted

This PR adds a simple check to the splitCells helper function that validates that the cells array isn't empty before calling cells[cells.length - 1].trim(). This prevents the error "Cannot read properties of undefined (reading 'trim')" from being thrown.

Contributor

• Test(s) exist to ensure functionality and minimize regression (if no tests added, list tests covering this PR); or,
• no tests required for this PR.
• If submitting new feature, it has been documented in the appropriate places.

Committer

In most cases, this should be a different person than the contributor.

• CI is green (no forced merge required).
• Squash and Merge PR following conventional commit guidelines.

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[UziTech]

Thanks! 💯

[github-actions]

🎉 This PR is included in version 4.0.12 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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