fix(executor): Ignore not existing metadata. Fixes #5656

[alexec]

No description provided.

[codecov]

Codecov Report

Merging #5695 (20bb58b) into master (91c08cd) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

❗ Current head 20bb58b differs from pull request most recent head e29c468. Consider uploading reports for the commit e29c468 to get more accurate results

@@            Coverage Diff             @@
##           master    #5695      +/-   ##
==========================================
- Coverage   46.91%   46.82%   -0.09%     
==========================================
  Files         244      244              
  Lines       15209    15211       +2     
==========================================
- Hits         7135     7123      -12     
- Misses       7169     7182      +13     
- Partials      905      906       +1     

Impacted Files	Coverage Δ
workflow/executor/executor.go	16.18% <0.00%> (-0.06%)	⬇️
server/workflow/workflow_server.go	40.45% <0.00%> (-2.28%)	⬇️
cmd/argoexec/commands/emissary.go	48.43% <0.00%> (-1.57%)	⬇️
workflow/controller/operator.go	70.84% <0.00%> (-0.22%)	⬇️
cmd/argo/commands/get.go	56.95% <0.00%> (+0.64%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 91c08cd...e29c468. Read the comment docs.

[henrywangx]

@alexec Hi alex，should this fix be cherry-picked into v2.12？We also face this issue with v2.12