feat: resolve ConsumerConfig nil pointer problem

[DMwangnima]

This PR aims to solve this issue(#2439).

[chickenlj]

LGTM.

[codecov-commenter]

Codecov Report

Merging #2440 (c19e80a) into main (debe37d) will decrease coverage by 0.01%.
The diff coverage is 8.33%.

❗ Current head c19e80a differs from pull request most recent head 4d580bc. Consider uploading reports for the commit 4d580bc to get more accurate results

@@            Coverage Diff             @@
##             main    #2440      +/-   ##
==========================================
- Coverage   45.08%   45.08%   -0.01%     
==========================================
  Files         269      269              
  Lines       18167    18168       +1     
==========================================
  Hits         8191     8191              
+ Misses       9104     9102       -2     
- Partials      872      875       +3     

Files	Coverage Δ
config/reference_config.go	28.08% <8.33%> (+4.40%)	⬆️

... and 1 file with indirect coverage changes

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[sonarcloud]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication