[CDF-306] - CCC - Lines with a single null-valued series fail to highlight correctly when hovered-over.
* Fixed confusion between a null series value and an undefined value..., for when activeSeriesAware is on.
* Fixed not looking at the owner scene's active state (for when activeSeriesAware is off)
Merge pull request #109 from dcleao/CDF-306

[CDF-306] - CCC - Lines with a single null-valued series fail to highlight correctly when hovered-over.