[bug fix] fixup config listen cache empty

[robynron]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (65e2c9d) 29.67% compared to head (059ce86) 29.93%.

❗ Current head 059ce86 differs from pull request most recent head 4618db0. Consider uploading reports for the commit 4618db0 to get more accurate results

Files	Patch %	Lines
clients/config_client/config_client.go	64.70%	5 Missing and 1 partial ⚠️
vo/config_param.go	66.66%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #697      +/-   ##
==========================================
+ Coverage   29.67%   29.93%   +0.26%     
==========================================
  Files          40       41       +1     
  Lines        3144     3153       +9     
==========================================
+ Hits          933      944      +11     
+ Misses       2139     2137       -2     
  Partials       72       72              

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[robynron]

fixup #694 #692

[binbin0325]

LGTM