Validates a control against an array of validators, and returns
an array of the same length containing a combination of error messages
(from invalid validators) and null values (from valid validators)
// { AbstractControl } control - control to validate
// { IValidatorFn[] } validators - array of validators
// { boolean } invert - invert?
// { PlainObject[] } - array of nulls and error message
'_executeValidators' utility function
Validates a control against an array of validators, and returns an array of the same length containing a combination of error messages (from invalid validators) and null values (from valid validators)
// { AbstractControl } control - control to validate // { IValidatorFn[] } validators - array of validators // { boolean } invert - invert? // { PlainObject[] } - array of nulls and error message