Allow a collection with Automation.Null elements to be piped to pipeline
#16957
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PR Summary
Fix #14920
Allow a collection with
Automation.Nullelements to be piped to pipeline.AutomationNull.Valueis used as the indicator that there is no data in the input pipe. The right behavior is to skipAutomationNull.Valueelements from the enumerator and move to the next item in that case.PR Checklist
.h,.cpp,.cs,.ps1and.psm1files have the correct copyright headerWIP:or[ WIP ]to the beginning of the title (theWIPbot will keep its status check atPendingwhile the prefix is present) and remove the prefix when the PR is ready.