Fix the problem that return empty result while listing users #6532
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What type of PR is this?
/kind bug
/area core
/milestone 2.19.0
What this PR does / why we need it:
This PR makes the return value of method
DefaultRoleService#getRolesByUsernames
never beMono#empty
.See #6528 for more.
Which issue(s) this PR fixes:
Fixes #6528
Special notes for your reviewer:
http -a admin:admin http://127.0.0.1:8090/apis/api.console.halo.run/v1alpha1/users?keyword=xyz
.Does this PR introduce a user-facing change?