SPARKL query - current indian actors who do not have des in ml

#no description
SELECT ?item ?itemLabel ?itemLabel_ml
WHERE
{
  ?item wdt:P106 wd:Q33999 ;
          wdt:P27 wd:Q668 ;
          wdt:P21 wd:Q6581072 .
  optional {?item rdfs:label ?itemLabel_ml . filter(lang(?itemLabel_ml)="ml")}
  filter not exists {?item schema:description ?itemDesc_ml . filter(lang(?itemDesc_ml)="ml")}
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}