Fix erroneous override of work unit status

[TheRealHaoLiu]

Certain failure condition that doesn't write stdinErr or stdoutErr result in the code erroneously overriden failed work unit status

This hides the real failure and cause us to end up with

"result_traceback": "Receptor detail:\nFinished",

instead of the real reason why the job failed (in this case k8s API server problem...)

[sonarqubecloud]

Quality Gate failed

Failed conditions

4.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (9f05dd2) 36.57% compared to head (ce1898c) 36.48%.
Report is 1 commits behind head on devel.

@@            Coverage Diff             @@
##            devel     #942      +/-   ##
==========================================
- Coverage   36.57%   36.48%   -0.09%     
==========================================
  Files          42       42              
  Lines        7878     7883       +5     
==========================================
- Hits         2881     2876       -5     
- Misses       4826     4837      +11     
+ Partials      171      170       -1     

Files	Coverage Δ
pkg/workceptor/kubernetes.go	2.51% <0.00%> (-0.02%)	⬇️

... and 3 files with indirect coverage changes

[AaronH88]

lgtm