Cannot add contributors when commitConvention is set to gitmoji,

[iqfareez]

Describe the bug
Adding contributors failed when using gitmoji in the commitConvention

To Reproduce
Steps to reproduce the behavior:

1. Install all-contributors bot
2. Create new repo (or can use existing)
3. Add first contributors. Eg @all-contributors please add @fareez2 for code & test
4. Merge the first PR created by the bot (including README and .all-contributorsrc files)
5. In .all-contributorsrc, change commitConvention to gitmoji. Commit the changes
6. Add another contributor. Eg: @all-contributors please add @iqfareez for docs & test

Expected behavior
A new PR should be created with contributor iqfareez.

Actual behavior

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Additional context

Changed back to other entries other than gitmoji fixes the issue.

[jlandure]

FYI, I got the same issue if you need more details. 😊

[unode]

#476 could be related as we are also using gitmoji there.