additional nullable annotation cleanup

[david-driscoll]

No description provided.

[codecov]

Codecov Report

Merging #384 into master will decrease coverage by 0.01%.
The diff coverage is 88.00%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
- Coverage   75.75%   75.73%   -0.02%     
==========================================
  Files         561      561              
  Lines       13508    13511       +3     
  Branches     1244     1269      +25     
==========================================
  Hits        10233    10233              
- Misses       3275     3278       +3     

Impacted Files	Coverage Δ
src/Client/LangaugeClientRegistry.cs	100.00% <ø> (ø)
...lient/LanguageClientServiceCollectionExtensions.cs	96.93% <ø> (ø)
src/Dap.Client/DefaultDebugAdapterClientFacade.cs	100.00% <ø> (ø)
src/Dap.Shared/DapResponseRouter.cs	85.41% <ø> (ø)
src/JsonRpc.Testing/JsonRpcServerTestBase.cs	100.00% <ø> (ø)
src/JsonRpc/HandlerCollection.cs	72.00% <ø> (ø)
src/JsonRpc/JsonRpcHandlerCollectionExtensions.cs	89.28% <ø> (ø)
src/JsonRpc/JsonRpcServer.cs	100.00% <ø> (ø)
src/JsonRpc/RequestRouterBase.cs	100.00% <ø> (ø)
src/JsonRpc/ResponseRouter.cs	86.11% <ø> (ø)
... and 43 more

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