await _finish_kernel_start

[jtpio]

This is the result of investigating the failing js-services tests in JupyterLab: jupyterlab/jupyterlab#11548

Looking at the code, it looks like this future is ensured with asyncio.ensure_future but never awaited.

[jtpio]

cc @blink1073 probably this one needs the await and not be behind the use_pending_kernels check?

[blink1073]

We need to add a guard on the use of pending kernels here, otherwise we will block and defeat the purpose of the feature.

[codecov-commenter]

Codecov Report

Merging #617 (005e783) into master (e3eec2a) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #617      +/-   ##
==========================================
+ Coverage   77.58%   77.62%   +0.04%     
==========================================
  Files         110      110              
  Lines       10402    10404       +2     
  Branches     1287     1288       +1     
==========================================
+ Hits         8070     8076       +6     
+ Misses       1933     1926       -7     
- Partials      399      402       +3     

Impacted Files	Coverage Δ
jupyter_server/services/kernels/kernelmanager.py	83.17% <100.00%> (+2.02%)	⬆️
jupyter_server/services/kernels/handlers.py	60.90% <0.00%> (-0.51%)	⬇️

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[blink1073]

Thanks!