ORA-06503: PL/SQL: Function returned without value when using EXCEPTION NO_DATA_FOUND

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Oracle

please check out the following plsql function ...
it makes a ORA-06503: PL/SQL: Function returned without value error when i remove the commented lines , this when calling it on a parameter that makes the function returns some data

function doSomething (param integer) return clob AS
    returnedVal clob := '';
    parentID integer;
    
    begin
        select eb.someField into parentID  from someTable eb where (eb.someField = param);
         
         
      -- EXCEPTION
      --   WHEN NO_DATA_FOUND THEN
      --   return returnedVal  ;
         
                  
         return returnedVal ;
    end;