Blurred background doesn't fade out when dismissing

[banaslee]

On the current master branch the blurred background doesn't fade out when dismissing.

I found out that by replacing the current animation block on dismissalTransitionWillBegin with the following makes it work.
if ([self shouldTransitionBlur]) { self.blurBackgroundView.alpha = 0.0; } else { self.dimmingView.alpha = 0.0; }

What I don't know is if it conflicts with anything since the previous code there seemed to explicitly treat the blurred background case by not doing anything.

[Schemetrical]

Good solution for now :-) @banaslee