popupSensorContent property Null safety

1. farmershands
2. string_constants
3. StringConstants
4. popupSensorContent property

StringConstants class

1. Constructors
2. StringConstants
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. appStoreAppUrlProd
13. appStoreAppUrlTest
14. playStoreAppUrlProd
15. playStoreAppUrlTest
16. popupAddCowsToGroupContent
17. popupAddCowsToGroupTitle
18. popupCopyCowsToOtherGroupContent
19. popupCopyCowsToOtherGroupFromTotalContent
20. popupCopyCowsToOtherGroupTitle
21. popupCreateNewCowContent
22. popupCreateNewCowTitle
23. popupCreateNewGroupContent
24. popupCreateNewGroupTitle
25. popupDiseaseObservationCreateSuccessContent
26. popupDiseaseObservationCreateSuccessTitle
27. popupDiseaseObservationDeleteCompleteContent
28. popupDiseaseObservationDeleteCompleteTitle
29. popupDiseaseObservationDeleteConfirmContent
30. popupDiseaseObservationDeleteConfirmTitle
31. popupDiseaseObservationInvalidContent
32. popupDiseaseObservationInvalidTitle
33. popupDiseaseObservationUpdateSuccessContent
34. popupDiseaseObservationUpdateSuccessTitle
35. popupExitAppContent
36. popupExitAppTitle
37. popupGatewayContent
38. popupGatewayTitle
39. popupMoveCowsToOtherGroupContent
40. popupMoveCowsToOtherGroupFromTotalContent
41. popupMoveCowsToOtherGroupTitle
42. popupRemoveCowContent
43. popupRemoveCowsFromGroupContent
44. popupRemoveCowsFromGroupTitle
45. popupRemoveCowTitle
46. popupRemoveGroupContent
47. popupRemoveGroupsContent
48. popupRemoveGroupsTitle
49. popupRemoveGroupTitle
50. popupSensorContent
51. popupSensorTitle
52. popupUpdateCowContent
53. popupUpdateCowTitle
54. timeYMDDashFormat
55. timeYMDDashHMSColonFormat
56. timeYMDDotFormat