Class: TMMConnection
function IsReady: Boolean;Returns True when Database is assigned and
both Database.SessionName and
Database.DatabaseName are non-empty.
Call IsReady to check that a valid EDB session and
database are in place before calling TMMScript.Execute or
TMMUpdater.Prepare. Both methods check the same condition
internally and return an error if it is not met; calling
IsReady first lets you show a clear message to the user
without waiting for an operation to fail.