[Dubbo-6963] fix bug: delete last config not take effect

[wikiwikiwiki]

fix #6963 ，修复删除最后一条动态配置不会生效的问题

[AlbumenJ]

@wikiwikiwiki Hi, thanks for your contribution.

Please merge the latest master branch to resolve confilcts.

[wikiwikiwiki]

@wikiwikiwiki Hi, thanks for your contribution.

Please merge the latest master branch to resolve confilcts.

already resolved

[codecov-commenter]

Codecov Report

Merging #6964 (f420df1) into master (68062c1) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #6964      +/-   ##
============================================
- Coverage     59.17%   59.13%   -0.04%     
  Complexity      529      529              
============================================
  Files          1076     1076              
  Lines         43451    43451              
  Branches       6352     6352              
============================================
- Hits          25711    25696      -15     
- Misses        14901    14919      +18     
+ Partials       2839     2836       -3     

Impacted Files	Coverage Δ	Complexity Δ
...e/dubbo/registry/integration/RegistryProtocol.java	57.94% <0.00%> (ø)	0.00 <0.00> (ø)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	59.40% <0.00%> (-4.96%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	16.00% <0.00%> (ø%)
...pache/dubbo/registry/support/AbstractRegistry.java	78.14% <0.00%> (-1.49%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty4/NettyClient.java	69.56% <0.00%> (-1.45%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	89.65% <0.00%> (ø)	0.00% <0.00%> (ø%)

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[AlbumenJ]

LGTM.

@wikiwikiwiki Do you have any time to add some unit test cases for this? I will merge this pr later, and we can do it in a new pull request.

[wikiwikiwiki]

LGTM.

@wikiwikiwiki Do you have any time to add some unit test cases for this? I will merge this pr later, and we can do it in a new pull request.

ok