#FEM-1299 (#126)
#FEM-1299 (#126)

* Fixed issue where adsManager initializing would crash when `IMAContentPlayhead` protocol’s `currentTime` property would return a NaN value.
Now makes a check `isNaN` to make sure it works.
kaltura/playkit-ios,kaltura/playkit-ios,kaltura/playkit-ios,kaltura/playkit-ios