[#4181] Add ChangeLog entry

diff --git a/changelog_unreleased/4181-expression-is-effectively-always-empty-in-flex-id b/changelog_unreleased/4181-expression-is-effectively-always-empty-in-flex-id
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+++ b/changelog_unreleased/4181-expression-is-effectively-always-empty-in-flex-id
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+[bug]          andrei
+       Fixed a bug introduced in flex-id in 3.1.2 which caused the
+       expression to always be empty even when a value was configured
+       under "identifier-expression".
+       (Gitlab #4181)