Differentiate between empty and nil input
Previously, CopyOf on an empty list was returning nil. With the updates to SortedUniqueStrings and FirstUniqueStrings, we need to differentiate between empty lists and nil. Bug: 275313114 Test: m nothing (cherry picked from https://android-review.googlesource.com/q/commit:cc4da765113299fa11dcb1e651ec4ae33e6f8f9b) Merged-In: I91063ebbe5013cbda5d8f70efde4683c66581599 Change-Id: I91063ebbe5013cbda5d8f70efde4683c66581599
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