917: Interdiffs aren't working anymore.

jeff****@gmai***** (Google Code) (Is this you? Claim this profile.)
Feb. 25, 2009
892
On attempting to look at an interdiff, the follow error is shown:

Traceback (most recent call last):
  File "c:\python25\lib\site-packages\ReviewBoard-1.0alpha4-
py2.5.egg\reviewboard\diffviewer\views.py", line 145, in view_diff
    interdiffset, highlighting, True)[0]
IndexError: list index out of range

The error is different looking at an interdiff from an unpublished review.  
It's the same when looking at 1 and interdiffing 2, but different when 
looking at 2 and interdiffing to 1.  (Where diff 2 is the latest diff.)