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Check for presence of an asset directory before accessing it (#12790)

Fixes https://github.com/flutter/flutter/issues/12460
J
Jason Simmons committed
cb2cfac0eb682ebcd106355e69e858866754fdc7
Parent: 1affb42
Committed by GitHub <noreply@github.com> on 10/31/2017, 12:04:30 AM