According to Filoni, they were originally going to use a vibroblade, but Lucas changed it because "there's no way that a non-lightsaber could block a lightsaber". 
Oy vey. ( Recall ROTS much? )
Filoni didn't say anything about TOR.
It seems noteworthy that in the KOTOR games vibroblades blocked lightsabers all the time.

Oy vey. ( Recall ROTS much? )Filoni didn't say anything about TOR.
It seems noteworthy that in the KOTOR games vibroblades blocked lightsabers all the time.
