Add condition to generation of dynamic job spec

[wild-endeavor]

TL;DR

Please see the issue for a proper description.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

If a launch plan/subworkflow node does not have outputs, currently there is no dynamic job spec created. This was the main issue this PR is meant to address.

Also discovered that if the workflow/launchplan yielded in a dynamic node does not have outputs, but does have inputs, those inputs would not be generated. This was from improper indentation from the first time this code was created.

This code needs to be cleaned up... a lot. See the follow-up issue.

Tracking Issue

flyteorg/flyte#282

Follow up issue

flyteorg/flyte#226

[feiyu-meng]

Thanks!

[codecov-io]

Codecov Report

Merging #109 into release-0.7 will increase coverage by 0.03%.
The diff coverage is 95.23%.

@@               Coverage Diff               @@
##           release-0.7     #109      +/-   ##
===============================================
+ Coverage        82.24%   82.28%   +0.03%     
===============================================
  Files              208      208              
  Lines            13266    13307      +41     
  Branches          1106     1109       +3     
===============================================
+ Hits             10911    10950      +39     
- Misses            2092     2094       +2     
  Partials           263      263              

Impacted Files	Coverage Δ
tests/flytekit/unit/models/test_dynamic_wfs.py	94.59% <95.00%> (+0.47%)	⬆️
flytekit/common/tasks/sdk_dynamic.py	95.00% <100.00%> (+0.05%)	⬆️

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