Remove repetitive and unnecessary judgment

[BurningCN]

What is the purpose of the change

The metadataService.getExportedURLs() method will be called in the selectMetadataServiceExportedURL method. This method has already made this judgment, so the repeated judgments here can be removed

[codecov-commenter]

Codecov Report

Merging #7869 (cead7fb) into master (e845e16) will increase coverage by 0.27%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7869      +/-   ##
============================================
+ Coverage     59.28%   59.55%   +0.27%     
- Complexity      529      555      +26     
============================================
  Files          1077     1088      +11     
  Lines         43565    43851     +286     
  Branches       6368     6399      +31     
============================================
+ Hits          25826    26115     +289     
+ Misses        14879    14833      -46     
- Partials       2860     2903      +43     

Impacted Files	Coverage Δ
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	43.83% <ø> (+0.13%)	⬆️
...ient/metadata/ProtocolPortsMetadataCustomizer.java	0.00% <ø> (ø)
.../dubbo/remoting/transport/MultiMessageHandler.java	80.00% <0.00%> (-20.00%)	⬇️
...bo/rpc/cluster/support/FailbackClusterInvoker.java	52.45% <0.00%> (-18.04%)	⬇️
...o/remoting/transport/ChannelHandlerDispatcher.java	60.00% <0.00%> (-10.00%)	⬇️
...ting/exchange/support/header/HeartbeatHandler.java	83.72% <0.00%> (-9.31%)	⬇️
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	61.53% <0.00%> (-8.03%)	⬇️
...apache/dubbo/rpc/protocol/injvm/InjvmProtocol.java	72.22% <0.00%> (-5.56%)	⬇️
.../threadpool/manager/DefaultExecutorRepository.java	80.95% <0.00%> (-4.54%)	⬇️
.../rpc/protocol/dubbo/LazyConnectExchangeClient.java	49.45% <0.00%> (-4.40%)	⬇️
... and 100 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e845e16...cead7fb. Read the comment docs.