fix empty protocol in consul registry. #4294

[cvictory]

#4294

consul empty protocol

[codecov-io]

Codecov Report

Merging #4354 into master will increase coverage by 0.04%.
The diff coverage is 78.57%.

@@             Coverage Diff             @@
##             master   #4354      +/-   ##
===========================================
+ Coverage     62.85%   62.9%   +0.04%     
- Complexity      449     452       +3     
===========================================
  Files           769     769              
  Lines         32995   33004       +9     
  Branches       5215    5215              
===========================================
+ Hits          20740   20761      +21     
+ Misses         9849    9841       -8     
+ Partials       2406    2402       -4

Impacted Files	Coverage Δ	Complexity Δ
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <78.57%> (+2.27%)	29 <3> (+2)	⬆️
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0%> (-0.95%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	81.6% <0%> (+1.53%)	0% <0%> (ø)	⬇️
...c/main/java/org/apache/dubbo/rpc/RpcException.java	86.2% <0%> (+3.44%)	0% <0%> (ø)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	62.35% <0%> (+4.7%)	21% <0%> (+1%)	⬆️
.../apache/dubbo/remoting/transport/AbstractPeer.java	71.73% <0%> (+8.69%)	0% <0%> (ø)	⬇️

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