isLoading property Null safety

1. farmershands
2. report_card_view_vm
3. ReportCardViewVM
4. isLoading property

ReportCardViewVM class

1. Constructors
2. ReportCardViewVM
3. Properties
4. barItemsDay
5. bottomString
6. currentEndAt
7. currentStartAt
8. dayAfterBirthStr
9. hashCode
10. hideGraph
11. isChecked
12. isDetailOpen
13. isLoading
14. isPinned
15. managementNumber
16. memoController
17. prevSelectedGraphViewType
18. report
19. reportCardContent
20. reportCardTitle
21. runtimeType
22. selectedAction
23. selectedDateTime
24. selectedGraphViewType
25. Methods
26. fetchGraphData
27. init
28. loadMoreGraphData
29. noSuchMethod
30. toggleDetailOpen
31. togglePinned
32. toString
33. Operators
34. operator ==