split_commits with new lines create duplicate entries

[AntoineGS]

Is there an existing issue for this?

• I have searched the existing issues

Description of the bug

When using split commits, if there is a an empty line between commits, it will duplicate the commit prior to the empty line, and I noticed that it will sometimes assign it to a different scope, though I have not investigated the why at this point.
One of the reasons this is a problem is that in certain GUIs (like GitHub Desktop) if you enter the first line in the header and the second line in the body, it will automatically add a new line.

Steps To Reproduce

Simply editing the test from changelog.rs to contain a new line in one of the commits as such:

will create a duplicated entry:

Expected behavior

No duplication in the output (we could ignore empty lines as an easy fix when using split commits?)

Screenshots / Logs

No response

Software information

• Operating system: Windows 10
• Rust version: 1.79
• Project version: tested with 2.2.1 and 2.1.2 and master branch

Additional context

I would like to undertake the changes, but wanted to discuss it first in case a different approach is preferred!
Thank you!

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