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Null sources appear to come from files that contain only external declarations. These sources can simply be ignored in the summation of the sizes of dart files that make up a module. Change-Id: I38864c7f4a3e208b19e26d5a887445fdf4622479 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/184901 Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Mark Zhou <markzipan@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>