Ensure initials appear in collaborative mode

[aychang95]

Relevant issues and PRs:
#302
#316

This tiny PR addresses the issue where self.current_user still provides a None var for initials in collaborative mode.

If initials are already generated from the names, then we shouldn't overwrite them with None.

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[aychang95]

@JasonWeill

Bug label and review is appreciated. Would love to use the official extension instead of my forked repo after the next release

[dlqqq]

BTW, to keep your branch's commit history clean while staying based on the latest main, I have a set of Git conventions that I'd like to recommend:

• origin should be the remote for the official repository, i.e. https://github.com/jupyterlab/jupyter-ai.
• self (or your GitHub username) should be the remote for your fork, i.e. https://github.com/americandatascience/jupyter-ai/tree/main
• The main branch should always track origin/main.
• Any branches should be made against your fork by pushing them to the self remote.

Here are the commands to emulate my setup.

# rename the official remote to `origin`, if necessary
# git remote rename <old-remote> origin

# add fork remote
git remote add self git@github.com:americandatascience/jupyter-ai.git

# set your dev branch to fix-initials
git checkout main
git checkout -b fix-initials

# reset main to track origin
git checkout main
git reset --hard origin/master
git branch -u origin

# push your dev branch to your fork
git checkout fix-initials
git push -u self

You should be able to change the branch of this PR to americandatascience:fix-initials.

Then, to sync with main without merge commits:

# get latest main
git checkout main
git pull

# rebase branch onto main
git checkout fix-initials
git rebase main
git push

to sync your PR's branch with main.

[welcome]

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

Thank you for contributing, we are very proud of you! ❤️

[dlqqq]

@meeseeksdev please backport to 1.x

[dlqqq]

@aychang95 Awesome work! 🎉