This scene was filmed. Another scene that was not which had a sketch done for it is Luke and Vader inside the shuttle on their ride to the death star which would have been right before this scene. It was on star wars official site like a lot of rare images only available to Hyperspace subscribers.

The sketch was done by an Art/Set designer on the film. To describe the interior lighting to be used inside the shuttle, and whether or not this set piece was even needed.

Many of the deleted scenes that were shot or not shot were dropped because they were not needed in the exposition of the main plot. Like the sandstorm scene, luke building his new lightsaber on tatooine, Jejjerod being force choked by Vader.

The scene that always bothered me not being in the film when i was a kid was how did Luke Get that Green Lightsaber When the one he had in the first 2 was blue that he lost getting his hand chopped off in cloud city.

I always thought the line Vader says " I see You have constructed a new Lightsaber. Your skills are complete indeed you are powerfull as the emporer has foreseen" Was a dead giveaway that the lightsaber scene was missing from the film.

See in the prequels All Jedi have Lightsabers and they really are not that special, but in the oot it was a Mark of being special if you could construct one and set the crystals properly. It was the last step to completing your jedi training. In the prequels they give them to younglings like they are trinkets in a cracker jack box. Which is silly because only someone special trained can wield one without accidentally cutting off their arm or something themselves since they can cut through anything. But in the prequels the younglings sabers have a stun setting,lol. The things lucas made up in the prequels like Midi-Chlorians, roflmao.