Fixed merger histogram code

Author: Garrett Brown

Recon3DLoadData.py

@@ -57,13 +57,12 @@ def MergerGenerator(T2D, T3D):
         while True:
             s2d = T2D.Generator().next()
             s3d = T3D.Generator().next()
-
-            if not T2D or not T3D:
+            if s2d and s3d:
+                yield s2d, s3d
+            else:
                 break
 
-            yield s2d, s3d
-
-    return MergerGenerator(Train_gen2D, Train_gen3D)
+    return MergerGenerator