Prevent failures when the checksuit branch is null. (#2436)
In presubmit PRs the checksuite branch is null causing the scheduler to
fail. If branch is null we use the default branch.
diff --git a/app_dart/lib/src/service/scheduler.dart b/app_dart/lib/src/service/scheduler.dart
index ca1ef72..c9b0080 100644
--- a/app_dart/lib/src/service/scheduler.dart
+++ b/app_dart/lib/src/service/scheduler.dart
@@ -472,7 +472,7 @@
} else {
try {
final RepositorySlug slug = checkRunEvent.repository!.slug();
- final String gitBranch = checkRunEvent.checkRun!.checkSuite!.headBranch!;
+ final String gitBranch = checkRunEvent.checkRun!.checkSuite!.headBranch ?? Config.defaultBranch(slug);
final String sha = checkRunEvent.checkRun!.headSha!;
// Only merged commits are added to the datastore. If a matching commit is found, this must be a postsubmit checkrun.
