if new_streams:

                    # check and modify entry;
                    # assert that title and url are present
                    modified = []
                    for row in new_streams:
                        if len(set(["", None]) & set([row.get("title"), row.get("url")])):
                            continue
                        try:
                            modified.append( self.postprocess(row) )
                        except Exception as e:
                            __print__(e, dbg.ERR, row)
                    new_streams = modified
      
                    # don't lose forgotten streams