🌱 cron: don't write anything for projects without URL (#4095)

We still run into the 429 GCS responses due to the lower limits on the same file.
All of the projects without a repo_url are being mapped to the same
object and leading to rate limiting.

"Maximum rate of writes to the same object name: One write per second"
https://cloud.google.com/storage/quotas#objects

Signed-off-by: Spencer Schrock <sschrock@google.com>

cron/internal/cii/main.go

@@ -42,6 +42,9 @@ func writeToCIIDataBucket(ctx context.Context, pageResp []ciiPageResp, bucketURL
 	for _, project := range pageResp {
 		projectURL := strings.TrimPrefix(project.RepoURL, "https://")
 		projectURL = strings.TrimPrefix(projectURL, "http://")
+		if projectURL == "" {
+			continue
+		}
 		jsonData, err := clients.BadgeResponse{
 			BadgeLevel: project.BadgeLevel,
 		}.AsJSON()