session: handle nil store for plugins (#37321)#37322

Merged

ti-chi-bot merged 1 commit intopingcap:release-6.1from ti-srebot:release-6.1-3a4e3eab83e8

Aug 23, 2022

+18-2

Commits on Aug 23, 2022

cherry pick pingcap#37321 to release-6.1

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