Agent uploads input.pb even if task input is None

[pingsutw]

Tracking issue

flyteorg/flyte#3936

Why are the changes needed?

Agent failed to run a PythonFunctionTask remotely since input.pb was not found.

What changes were proposed in this pull request?

Upload empty input.pb even if the input is None since --inputs is required by the pyflyte-execute command

flytekit/flytekit/bin/entrypoint.py

Line 454 in 47e15b6

@_click.option("--inputs", required=True)

How was this patch tested?

Run an agent task 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: 1 lines in your changes are missing coverage. Please review.

Comparison is base (530ad26) 83.18% compared to head (6403e0e) 86.00%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
flytekit/extend/backend/base_agent.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2054      +/-   ##
==========================================
+ Coverage   83.18%   86.00%   +2.81%     
==========================================
  Files         173      308     +135     
  Lines       16840    22945    +6105     
  Branches     3471     3468       -3     
==========================================
+ Hits        14009    19734    +5725     
- Misses       2236     2611     +375     
- Partials      595      600       +5     

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