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Fix bug in docs.dart (#72544)

Add a check that a pubspec file exists before trying to read it.
T
Todd Volkert committed
9a9339fbcb01b47ab28c2ebcc7dba31a3691ad77
Parent: 1c530a9
Committed by GitHub <noreply@github.com> on 12/17/2020, 10:47:45 PM