Blender Git Loki

NLA Eval Bugfix: Influence settings on active action didn't work

* The automatically calculated influence was overriding the value we were passing
into the dummy strip, making this seem like it doesn't work

* Made some tweaks to prevent some potential memory-related bugs
- nlastrips_ctime_get_strip() actually saves off references to the list of strips
it gets, so declaring dummy_strip in an inner scope like this could potentially
be quite dangerous
- Prevented a potential memory leak for the early abort when there are no strips
for whatever reason (it shouldn't occur though)