Indicates whether or not a publishing plug-in has publishing results available to display to the user.
HasPublishResults is used to determine whether or not a View button appears on the summary dialog that is displayed to the user after a publishing job completes. If this method returns true, a View button appears on the summary dialog; if this method returns false, a View button will not be shown on the summary dialog. Clicking the View button causes LaunchPublishResults to be called.
Note that if HasPublishResults returns false, LaunchPublishResults is never called.