Indicates if the Code and/or Text are valid for the reply.
function ReplyExists: Boolean; virtual;
Boolean - True when the Code and/or Text are valid for the reply.
ReplyExists is a Boolean function used to indicate when the Code for the reply contains a valid value. ReplyExists ensures that Code is not an empty string ('').
ReplyExists may be overridden in descendant classes to perform additional validation for the Code or Text assigned to the reply.