PR #39235 introduced additional cleanup logic for form controls and directives. The cleanup logic relies
on the presence of ControlValueAccessor instances on FormControlName and FormControl directives. In general
these fields are present and there are also checks to make sure that the mentioned directive instances are
created with CVAs. However some scenarios (primarily tests) may invoke the logic in a way that the directive
instance would not be fully initialized, thus causing CVA to be absent. As a result, the cleanup logic fails
while trying to call some methods on associated CVA instances.
This commit updates the cleanup logic to take into account the situation when CVA is not present.
Fixes#40521.
PR Close#40526
4d66185cbc