getReadableRange static method Null safety

1. baguette
2. DateTimeUtils
3. DateTimeUtils
4. getReadableRange static method

DateTimeUtils class

1. Constructors
2. DateTimeUtils
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. DATE_FORMAT
13. DATE_FORMAT_DAYS
14. DATE_FORMAT_DAYS_MONTH
15. Static methods
16. countDays
17. currentMillis
18. firstDay
19. getDays
20. getReadable
21. getReadableRange
22. lastDay
23. openDatePicker
24. openDateRangePicker
25. openMonthPicker