FIX: last visit bar regression (PR #10224)

Last visit bar is missing because of that change: https://github.com/discourse/discourse/commit/9b7000dbf10

Order property was changed from “default” to null and it was picked by guard condition

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This pull request has been mentioned on Discourse Meta. There might be relevant details there:

https://meta.discourse.org/t/orange-last-visit-marker-dissapeared/157339/15