a527b4d9b0
This CL replaces a null check with a null-aware collection element. Change-Id: Ib5630db2d72f822e640aec796de8d56b604e1511 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/506360 Reviewed-by: Samuel Rawlins <srawlins@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>