docs: public List<Class<?>> optionallyFindClasses(Iterable<String> classNames) {
          List<Class<?>> answer = new ArrayList<Class<?>>();
          for (String className : classNames) {
              Class<?> aClass = optionallyFindClass(className);
              if (aClass != null) {
                  answer.add(aClass);
              }
          }
          return answer;
      }