fix: watch returns raw_object if detection of returned objects fail

[tomplus]

Closes #176

[codecov]

Codecov Report

Merging #177 (7d86e52) into master (f2b270d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   30.34%   30.34%           
=======================================
  Files         777      777           
  Lines       91626    91632    +6     
=======================================
+ Hits        27804    27810    +6     
  Misses      63822    63822           

Impacted Files	Coverage Δ
kubernetes_asyncio/watch/watch.py	93.45% <100.00%> (ø)
kubernetes_asyncio/watch/watch_test.py	97.22% <100.00%> (+0.12%)	⬆️

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[athornton]

Thank you! I have verified that applying the partial-application trick now works in kubernetes_asyncio-based kubespawner!