[NOREF] - Fixed task list last updated

[patrickseguraoddball]

NOREF

Changes and Description

The last updated time on IT Solutions in the task list was incorrect. There was an incorrect non-null assertion, where null values were actually being passed. This causes an incorrect datestring comparison.

Slack thread

• Filtered for null values before comparing
• Added unit test

How to test this change

PR Author Review Checklist

• Met the ticket's acceptance criteria, or will meet them in a subsequent PR.
• Added or updated tests for backend resolvers or other functions as needed.
• Added or updated client tests for new components, parent components, functions, or e2e tests as necessary.
• Updated the Postman Collection if necessary.

PR Reviewer Guidelines

• It's best to pull the branch locally and test it, rather than just looking at the code online!
• Check that all code is adequately covered by tests - if it isn't feel free to suggest the addition of tests.
• Always make comments, even if it's minor, or if you don't understand why something was done.