Test empty changelog

[hbcarlos]

solves #131

I'm trying to remove the ...None from the diff when the changelog is empty. I'm not sure if this is the right solution. I'm a bit lost on how the release works. Meanwhile, I added a test to check if the changelog is empty.

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[codecov-commenter]

Codecov Report

Merging #243 (9b7f157) into main (9d9ec2f) will decrease coverage by 0.00%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
- Coverage   85.10%   85.09%   -0.01%     
==========================================
  Files          19       19              
  Lines        2336     2348      +12     
  Branches      302      303       +1     
==========================================
+ Hits         1988     1998      +10     
- Misses        251      252       +1     
- Partials       97       98       +1     

Impacted Files	Coverage Δ
jupyter_releaser/changelog.py	85.45% <33.33%> (-1.59%)	⬇️
jupyter_releaser/tests/test_functions.py	98.63% <100.00%> (+0.08%)	⬆️
jupyter_releaser/tests/util.py	99.25% <100.00%> (+<0.01%)	⬆️

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[blink1073]

LGTM, thanks! Just needs a pre-commit run

[hbcarlos]

Thanks @blink1073!

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Congrats on your first merged pull request in this project! 🎉

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[jtpio]

Thanks!

Starting a new 0.11.2 release with this change.