I doubt if air would get trapped in the line there, or certainly no significant amount. The internal diameter of braided hose is only about 2mm. Many bikes have a problem with air trapped at the banjo where that is the highest point but the master cylinder is pretty level on the Scrambler. I reckon that if you turn the bars fully left and push down on the hose any air will move to the master cylinder, being the highest point. A few gentle "jiggles" of the brake lever would encourage the air back up through the reservoir.