fix for 'copyWithLocations is not a function' bug #108
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There is a bug in EpubNavigator.ts in syncLocation where it calls
nearestPositions.first.copyWithLocations. On startup there are cases where the object nearestPositions.first exists but it has not had copyWithLocations added to it yet. This draft PR adds a private function, isFunctionOfObject, that can be used to check if this object exists. It then returns from syncLocation if the function doesn't exist. You may want to deal with the case in a different way but this should at least help demonstrate the issue.