def to_vobject_etag(self, project, uid):
return self.to_vobjects(project, [uid])[<NUM_LIT:0>][<NUM_LIT:1>:<NUM_LIT:3>]<EOL>
Return iCal object and etag of one Taskwarrior entry

        project -- the Taskwarrior project
        uid -- the UID of the task