Unnessary judgement when compose joint

[ianhhhhhhhhe]

In composer.js , after the code that judge the type of client

	if (conf.bLight && !params.lightProps){
		var network = require('./network.js');
		network.requestFromLightVendor(
			'light/get_parents_and_last_ball_and_witness_list_unit', 
			{witnesses: arrWitnesses}, 
			function(ws, request, response){
				if (response.error)
					return params.callbacks.ifError(response.error);
				if (!response.parent_units || !response.last_stable_mc_ball || !response.last_stable_mc_ball_unit || typeof response.last_stable_mc_ball_mci !== 'number')
					return params.callbacks.ifError("invalid parents from light vendor");
				params.lightProps = response;
				composeJoint(params);
			}
		);
		return;
	}

(line 383)

, the program judge it again.

	if (conf.bLight && !lightProps)
		throw Error("no parent props for light");

(line 436)

Why?

If I am using a light client, after I get all information from the vendor, the params.lightProps will be deleted and the lightProps must be null, and the the code will be an unnecessary code. Am I thinking right?