[type:fix] fix cache exist empty data

[moremind]

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• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4716 (b8a6f3d) into master (41d511b) will decrease coverage by 0.11%.
The diff coverage is 47.36%.

@@             Coverage Diff              @@
##             master    #4716      +/-   ##
============================================
- Coverage     66.50%   66.40%   -0.11%     
+ Complexity     8045     8035      -10     
============================================
  Files          1111     1111              
  Lines         32166    32183      +17     
  Branches       2905     2907       +2     
============================================
- Hits          21391    21370      -21     
- Misses         9079     9112      +33     
- Partials       1696     1701       +5     

Impacted Files	Coverage Δ
...plugin/springcloud/cache/ServiceInstanceCache.java	16.66% <0.00%> (-3.34%)	⬇️
...pache/shenyu/plugin/base/cache/MatchDataCache.java	65.30% <40.00%> (-6.49%)	⬇️
.../plugin/base/cache/CommonPluginDataSubscriber.java	64.00% <100.00%> (+1.24%)	⬆️

... and 9 files with indirect coverage changes

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