Change minio use virtual config to not panic

[xiaofan-luan]

minio use virtual should not panic if empty. User may use other object storage instead

[sre-ci-robot]

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[mergify]

@xiaofan-luan

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.59%. Comparing base (a2b5175) to head (9a8a5b1).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #35327      +/-   ##
==========================================
- Coverage   84.90%   81.59%   -3.32%     
==========================================
  Files         938     1222     +284     
  Lines      119028   143323   +24295     
==========================================
+ Hits       101059   116942   +15883     
- Misses      13545    21960    +8415     
+ Partials     4424     4421       -3     

Files	Coverage Δ
pkg/util/paramtable/service_param.go	98.29% <100.00%> (ø)

... and 334 files with indirect coverage changes

[czs007]

/lgtm