Blender Git Loki

Orange: Another NLA goodie. The NLA code didn't evaluate any strips when
the current frame was outside of strips. This gives potential errors with
playback that skips frames, or for a renderfarm. And, while editing the
poses got 'stuck' if you changed to different frames.

Now if no strips are found on 'current frame', always the first strip to
right is used, or the last strip to the left.