6D-reconstruction: use just introduced initialization function

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_Deformation/Gt6DBlobReconstructor.m

@@ -572,7 +572,11 @@ classdef Gt6DBlobReconstructor < Gt6DVolumeToBlobProjector
             end
 
             c = tic();
-            proj_bls = gtMathsGetSameSizeZeros(self.blobs);
+            if (self.algo_ops_c_functions)
+                proj_bls = gtCxx6DCreateEmptyBlobs(self.blobs);
+            else
+                proj_bls = gtMathsGetSameSizeZeros(self.blobs);
+            end
             timing_in = toc(c);
 
             timing_fp = 0;