Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: grootSH <112615049+Steven4Hooisma@users.noreply.github.com>

pkg/accessreview/drivers/upcloud.go

@@ -116,10 +116,9 @@ func (d *UpCloudDriver) ListAccounts(ctx context.Context) ([]AccountRecord, erro
 
 	records := make([]AccountRecord, 0, len(resp.Accounts.Account))
 
-	for _, a := range resp.Accounts.Account {
 		username := strings.TrimSpace(a.Username)
 		if username == "" {
-			continue
+			return nil, fmt.Errorf("upcloud returned an account with an empty username")
 		}
 
 		fullName := username