(Inconsistency with "Add Component" feature behaviour)
1 Create new project
2 Create new Animator Controller
3 Create an empty animation state and select it
4 Click on "Add behaviour" button
Input "test" value into search field (you mustn't have such script in your project) and hit "Enter"

Expected result:
If search failed to find such behaviour it should suggest create a new one with THAT name as Add component feature does.

Actual result:
If search failed to find such behaviour it suggests to create a new one with EMPTY name