Fixing problem with ListParameter and Dynamic Dependencies #2970
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Description
The fix is to allow ListParameter parsing to return None or a list.
Motivation and Context
Here we are addressing issue #2969
It is necessary to allow the same behavior as a regular task's parameter handling on a task with dynamic requirements.
Have you tested this? If so, how?
Yes, I executed the same example reported in the issue and it fixes the problem.
Edit: also added tests on test/parameter_test.py