EmptyIntRange constructor Null safety

1. collection_ext
2. ranges
3. EmptyIntRange
4. EmptyIntRange const constructor

EmptyIntRange class

1. Constructors
2. EmptyIntRange
3. Properties
4. first
5. from
6. hashCode
7. isEmpty
8. isNotEmpty
9. iterator
10. last
11. length
12. runtimeType
13. single
14. step
15. to
16. Methods
17. any
18. cast
19. contains
20. elementAt
21. every
22. expand
23. firstWhere
24. fold
25. followedBy
26. forEach
27. join
28. lastWhere
29. map
30. noSuchMethod
31. reduce
32. singleWhere
33. skip
34. skipWhile
35. take
36. takeWhile
37. toList
38. toSet
39. toString
40. where
41. whereType
42. Operators
43. operator ==