Add changelog entry

Author: querkmachine

CHANGELOG.md

@@ -267,6 +267,7 @@ We've made fixes to GOV.UK Frontend in the following pull requests:
 
 - [#5311: Remove non-operational value parameter from file upload component](https://github.com/alphagov/govuk-frontend/pull/5311)
 - [#6434: Fix rebranded header background being visible when printed](https://github.com/alphagov/govuk-frontend/pull/6434) - thanks to @lewis-softwire for reporting this issue
+- [#6447: Fix pagination outputting empty links when provided a null or empty value](https://github.com/alphagov/govuk-frontend/pull/6447) – thanks to @NikhilNanjappa for reporting this issue
 
 ## v6.0.0-beta.0 (Beta breaking release)