airframe-http-netty: Fix empty response handling

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #2924 (e50f43f) into master (103acde) will increase coverage by 0.01%.
The diff coverage is 87.50%.

❗ Current head e50f43f differs from pull request most recent head 0fcb5c3. Consider uploading reports for the commit 0fcb5c3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2924      +/-   ##
==========================================
+ Coverage   82.78%   82.79%   +0.01%     
==========================================
  Files         345      345              
  Lines       14543    14549       +6     
  Branches     2374     2398      +24     
==========================================
+ Hits        12039    12046       +7     
+ Misses       2504     2503       -1     

Impacted Files	Coverage Δ
...scala/wvlet/airframe/http/client/HttpClients.scala	79.67% <81.81%> (-1.00%)	⬇️
...vlet/airframe/http/netty/NetthRequestHandler.scala	80.00% <100.00%> (+0.68%)	⬆️

... and 2 files with indirect coverage changes

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