[1.0] Scenario Crash final battle

Really enjoyed playing the Scenario, loved the scripted hero events, had not seen those guys before.  I held out for the 1.0 release before trying it but still ran into a bug at the end of the game.

***Spoiler***

After attacking and losing against the Tower defenders with a single hero, I later came back with my main army and beat them.  However as soon as I choose to leap in afterwards, get crash to desktop instead of loading the final battle.  Luckily I had a save from before I attacked and lost to the tower,so I went strait at it with my main force including sov and it worked just fine.

Only other thing different between the saves is that I killed the wraith faction, so I'm thinking that the prior failed tower attack is what caused the issue.