Adjust keywords, if needed.

def _adj_include_only(self):
        """Adjust keywords, if needed."""
        if 'include_only' in self.kws:
            # Process GO IDs specified in include_only
            goids = self._get_goids(self.kws['include_only'])
            # include_only can take a list of GO IDs on cmdline or in a file.
            #     --include_only=GO:0043473,GO:0009987
            #     --include_only=include_only.txt
            if goids:
                self.kws['include_only'] = goids
            else:
                raise Exception("NO GO IDs FOUND IN include_only")