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"Their" is totally a gender-neutral 3nd person singular now.

Now? It's been a gender-neutral 3rd person singular for hundreds of years.

More than you want to read about this:

That's awkward passive voice. How about "myusername has not listed skills"?

What about "myusername has not listed any skills."?

Or "myusername has no skills". That way you encourage people to add their skills.

Shorter: "myusername has no listed skills."

"myusername has listed no skills" sounds better to my ear.

Doesn't cater for users who only have one skill to list. ;)