fix: restore pirt nil pointer bug

[wangyelei]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 65.00%. Comparing base (6e3b7a4) to head (a136286).
Report is 3 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
pkg/dataprotection/restore/manager.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8286      +/-   ##
===============================================
+ Coverage        64.96%   65.00%   +0.03%     
===============================================
  Files              358      358              
  Lines            45252    45253       +1     
===============================================
+ Hits             29398    29416      +18     
+ Misses           13236    13229       -7     
+ Partials          2618     2608      -10     

Flag	Coverage Δ
unittests	65.00% <0.00%> (+0.03%)	⬆️

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