SearchCowScreenVM constructor Null safety

1. farmershands
2. search_cow_screen_vm
3. SearchCowScreenVM
4. SearchCowScreenVM constructor

SearchCowScreenVM class

1. Constructors
2. SearchCowScreenVM
3. Properties
4. cows
5. errorMessage
6. hashCode
7. keyword
8. page
9. runtimeType
10. searchResult
11. searchResultFetcher
12. searchTextFieldController
13. searchTextFieldFocusNode
14. Methods
15. fetchCows
16. init
17. noSuchMethod
18. release
19. resetCows
20. toString
21. Operators
22. operator ==