fix(*): empty cpuset.mems will lead to failure of tmo

[cheney-lin]

What type of PR is this?

Bug fixes

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 59.67742% with 25 lines in your changes missing coverage. Please review.

Project coverage is 55.88%. Comparing base (19aa317) to head (c909ef8).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/util/cgroup/manager/cgroup.go	55.26%	12 Missing and 5 partials ⚠️
pkg/util/cgroup/manager/v1/fs_linux.go	66.66%	2 Missing and 1 partial ⚠️
pkg/util/cgroup/manager/v2/fs_linux.go	66.66%	2 Missing and 1 partial ⚠️
...ins/memory/dynamicpolicy/policy_advisor_handler.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #721      +/-   ##
==========================================
- Coverage   56.04%   55.88%   -0.16%     
==========================================
  Files         594      597       +3     
  Lines       67830    68011     +181     
==========================================
- Hits        38012    38009       -3     
- Misses      25771    25955     +184     
  Partials     4047     4047              

Flag	Coverage Δ
unittest	55.88% <59.67%> (-0.16%)	⬇️

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[yadzhang]

LGTM