Add null handling to sort query parameters

[pheyken]

Closes #3152

• [x] You have read the Spring Data contribution guidelines.
• [x] You use the code formatters provided here and have them applied to your changes. Don’t submit any formatting related changes.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] You added yourself as author in the headers of the classes you touched. Amend the date range in the Apache license header if needed. For new types, add the license header (copy from another file and set the current year only).

[pheyken]

Hey @mp911de, thank you so much for picking this up!

Is there anything I might be able to help you with to get this rolling? Do you by chance have an update on when / how this PR might move forward?

[dmarsh26]

Is anything happing to close this item?