Avoid spamming leaderboard cache errors when startup is cancelled. (#924)

				rows, err := db.QueryContext(ctx, query, params...)

				if err != nil {

					startupLogger.Error("Failed to caching leaderboard ranks", zap.String("leaderboard_id", leaderboard.Id), zap.Error(err))

					if err == context.Canceled {

						return // all further attempts will be failing, no point in trying them

					} else {

						break

					}

				}

				// Read score information.

				for rows.Next() {