Fix on branch master, consumer invoke timeout cause NPE.

[wangchengming666]

issue no #8586

[changfubai]

LGTM.

[xiaoheng1]

LGTM

[codecov-commenter]

Codecov Report

Merging #8587 (b523377) into master (fd80172) will decrease coverage by 0.75%.
The diff coverage is 46.66%.

@@             Coverage Diff              @@
##             master    #8587      +/-   ##
============================================
- Coverage     61.04%   60.28%   -0.76%     
+ Complexity      448      446       -2     
============================================
  Files          1097     1097              
  Lines         44407    44361      -46     
  Branches       6470     6439      -31     
============================================
- Hits          27109    26744     -365     
- Misses        14313    14637     +324     
+ Partials       2985     2980       -5     

Impacted Files	Coverage Δ
.../dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java	50.00% <0.00%> (-0.67%)	⬇️
...he/dubbo/rpc/protocol/dubbo/DubboCodecSupport.java	64.28% <77.77%> (ø)
...gcenter/wrapper/CompositeDynamicConfiguration.java	0.00% <0.00%> (-73.34%)	⬇️
...ookeeper/ZookeeperDynamicConfigurationFactory.java	0.00% <0.00%> (-66.67%)	⬇️
...pport/zookeeper/ZookeeperDynamicConfiguration.java	0.00% <0.00%> (-62.86%)	⬇️
...fig/configcenter/TreePathDynamicConfiguration.java	31.42% <0.00%> (-54.29%)	⬇️
.../dubbo/metadata/report/MetadataReportInstance.java	12.50% <0.00%> (-40.63%)	⬇️
.../configcenter/support/zookeeper/CacheListener.java	0.00% <0.00%> (-34.29%)	⬇️
...gistry/client/migration/MigrationRuleListener.java	55.88% <0.00%> (-23.53%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0.00%> (-20.69%)	⬇️
... and 61 more

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