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We don't report UNUSED_IMPORT when the library file does not exist, so that libraryElement.isSynthetic, and an empty but existing file is not the same as not existing at all. R=brianwilkerson@google.com Change-Id: I33d911b01f2ca7e1f5c4fdda7083507f469ec6c3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101580 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>