Prepopulate ArrayNode output literals with TaskNode interface output variables

[hamersaw]

Tracking issue

NA

Why are the changes needed?

When ArrayNode is executed with an empty input collection, it writes a 0 length output file. This results in an error when resolving downstream literals, for example:

failed at Node[end-node]. BindingResolutionError: Error binding Var [wf].[o0], caused by: failed at Node[n0]. OutputsNotFoundError: Outputs not found at [s3://my-s3-bucket/metadata/propeller/flytesnacks-development-f91c3120d59d74d4783b/n0/data/0/outputs.pb]

What changes were proposed in this pull request?

This PR prepopulates the outputLiteral of an ArrayNode with empty collections using the subNode output variable names. Therefore, when provided an input collection of 0 length we correctly write an output collection of 0 length.

How was this patch tested?

locally.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

NA

Docs link

NA

[codecov]

Codecov Report

Attention: Patch coverage is 65.38462% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 59.00%. Comparing base (eb24107) to head (a829d4b).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...ytepropeller/pkg/controller/nodes/array/handler.go	65.38%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5080      +/-   ##
==========================================
+ Coverage   58.98%   59.00%   +0.01%     
==========================================
  Files         645      645              
  Lines       55590    55616      +26     
==========================================
+ Hits        32791    32814      +23     
- Misses      20204    20207       +3     
  Partials     2595     2595              

Flag	Coverage Δ
unittests	59.00% <65.38%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.