Description of problem:

Tasks getting skipped when there is uninitialised task results used in param
The uninitialized result caused silent failures in when-expressions
The pipeline appeared to have issues with when-expression evaluation
No error messages indicated the actual problem (uninitialised result)

Prerequisites (if any, like setup, operators/versions): 4.16.20/1.16.2

Steps to Reproduce

parent task sets empty result

child task use parent generated result in param value

Actual results:

Task get skipped

Expected results:

Should throw error that param has empty value

Reproducibility (Always/Intermittent/Only Once): Always

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

 *