Add changelog entry for #5121 [ci skip]

Author: OTP Changelog Bot

docs/Changelog.md

@@ -19,6 +19,7 @@ based on merged pull requests. Search GitHub issues and pull requests for smalle
 - Fix SIRI ET PubSub updater shutdown [#5104](https://github.com/opentripplanner/OpenTripPlanner/pull/5104)
 - OSM: Break out of processing a malformed level map [#5096](https://github.com/opentripplanner/OpenTripPlanner/pull/5096)
 - Create unique SIRI-ET PubSub subscription [#5118](https://github.com/opentripplanner/OpenTripPlanner/pull/5118)
+- Handle JsonParseException [#5121](https://github.com/opentripplanner/OpenTripPlanner/pull/5121)
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