dont log Ignoring request with Size null

[SimonCropp]

fixes #1220

[codecov-commenter]

Codecov Report

Merging #1348 (405b9ff) into main (3d186db) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 405b9ff differs from pull request most recent head baf3abb. Consider uploading reports for the commit baf3abb to get more accurate results

@@            Coverage Diff             @@
##             main    #1348      +/-   ##
==========================================
+ Coverage   82.61%   82.64%   +0.02%     
==========================================
  Files         215      215              
  Lines        7146     7145       -1     
  Branches     1406     1407       +1     
==========================================
+ Hits         5904     5905       +1     
+ Misses        808      806       -2     
  Partials      434      434              

Impacted Files	Coverage Δ
...etCore.Grpc/ProtobufRequestExtractionDispatcher.cs	0.00% <ø> (ø)
...y/Extensibility/RequestBodyExtractionDispatcher.cs	96.29% <100.00%> (+0.14%)	⬆️

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