[Backport 5.1]: Allow for null revision resolver when using repo embeddings job's empty revision string

client/web/src/enterprise/site-admin/cody/RepoEmbeddingJobNode.tsx

@@ -50,6 +50,8 @@ export const RepoEmbeddingJobNode: FC<RepoEmbeddingJobNodeProps> = ({
                         <Link to={`${repo.url}@${revision.oid}`}>
                             {repo.name}@{revision.abbreviatedOID}
                         </Link>
+                    ) : repo ? (
+                        <>{repo.name}</>
                     ) : (
                         <div>Unknown repository</div>
                     )}

enterprise/cmd/frontend/internal/embeddings/resolvers/repo_embedding_jobs.go

@@ -214,9 +214,16 @@ func (r *repoEmbeddingJobResolver) Revision(ctx context.Context) (*graphqlbacken
 	if err != nil {
 		return nil, err
 	}
-	if repoResolver == nil {
+
+	// An empty revision value can accompany a valid repository if gitserver cannot resolve the default branch or latest revision during job scheduling.
+	// The job will always fail in this case and must be displayed in site admin despite the gitserver error.
+	// Site admin will only provide the job's failure_message in this case.
+	invalidRevision := r.job.Revision == ""
+
+	if repoResolver == nil || invalidRevision {
 		return nil, nil
 	}
+
 	return graphqlbackend.NewGitCommitResolver(r.db, r.gitserverClient, repoResolver, r.job.Revision, nil), nil
 }