Fix unexplained detailed diffs #1696
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Fixes pulumi/pulumi-aws#3439
makeDetailedDiff does not report collection changes. It instead hopes that elements of the collection will produce diff entries. When changes involve collections all the way down and there are no element entries, makeDetailedDiff produces no records.
However we have some workarounds now that produce a DIFF_SOME even when there are no entries per
#1501
The change in this PR embellishes this case with collection-level diffs so there is at least something to show.