statistics: fix merge global stats panic if the partition hasn't been analyzed before#39123

Merged

ti-chi-bot merged 2 commits intopingcap:masterfrom Yisaer:fix_39121

Nov 15, 2022

+37-6

Commits on Nov 14, 2022

fix 39121
Yisaer
committed

Commits on Nov 15, 2022

Merge branch 'master' into fix_39121
xhebox
authored