fix: potential nil panic

[jim3ma]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #2602 (152e975) into main (8f6f20b) will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2602      +/-   ##
==========================================
+ Coverage   51.62%   51.66%   +0.04%     
==========================================
  Files         158      158              
  Lines       21020    21020              
==========================================
+ Hits        10851    10860       +9     
+ Misses       9550     9538      -12     
- Partials      619      622       +3     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.66% <0.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
client/daemon/peer/peertask_manager.go	25.65% <0.00%> (ø)
client/daemon/rpcserver/rpcserver.go	48.40% <0.00%> (ø)

... and 1 file with indirect coverage changes

[gaius-qi]

LGTM