Client crashes from the trainer screen

[paco6381]

Steps to reproduce:

1. Select a lvl 50 character that has a second build at level 1

2. Level up to lvl 34

3. Talk to the trainer and open up the lvl 35 train up UI

4. Select a power from an epic pool, but don't click Finish

5. Click Cancel

6. Log out and in on a lower level character

7. Talk to the trainer and level up

8. Observe that the power from the epic pool is selected

9. Click Finish

10. The client will crash.