fix ServiceExtendedIndicator return nil object

[luomingmeng]

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 22.72727% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 55.48%. Comparing base (2d6e0a3) to head (27b95a1).
Report is 6 commits behind head on main.

Files	Patch %	Lines
pkg/metaserver/spd/manager.go	22.72%	13 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   55.52%   55.48%   -0.04%     
==========================================
  Files         552      552              
  Lines       59056    59188     +132     
==========================================
+ Hits        32788    32842      +54     
- Misses      22842    22918      +76     
- Partials     3426     3428       +2     

Flag	Coverage Δ
unittest	55.48% <22.72%> (-0.04%)	⬇️

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