ZF-6953: Identical should allow empty strings as valid token
Currently Zend_Validate_Identical use empty() to test, if there is a "MISSING_TOKEN" error, but this means, that an empty string would also be a "missing token". I think an empty string should be a valid token, because if i test an empty string against an empty string-token it is valid in my opinion.
I use this validator for password confirmation, but when i edit a user an empty password is allowed as it means "no change". At the other hand there is the NotEmpty-validator which will validate the case, that its not allowed to be empty. It seems confusing, that two identical (empty) strings are not compareable this way.