fix bugs

src/main/java/com/seec/bok/service/InteractiveService.java

@@ -57,6 +57,7 @@ public class InteractiveService {
                 questionIdList.add(i.getQuestionId());
             });
         }
+
         return questionService.findByIdIn(questionIdList,pageable);
     }
 

src/main/java/com/seec/bok/service/QuestionService.java

@@ -30,11 +30,26 @@ public class QuestionService {
     }
 
     public PageableQuestionListVO findByIdIn(Collection<String> id, Pageable pageable) {
+        if(id==null||id.size()==0){
+            return PageableQuestionListVO.builder()
+                    .questions(new ArrayList<>())
+                    .page(
+                            PageVO.builder()
+                                    .size(pageable.getPageSize())
+                                    .totalPages(0)
+                                    .totalElements(0L)
+                                    .number(0)
+                                    .build())
+                    .build();
+        }
         final Page<Question> questionPage = questionRepository.findByIdIn(id, pageable);
         PageableQuestionListVO vos=PageableQuestionListVO.of(questionPage);
         return vos;
     }
     public List<Question> findAllByIdIn(Collection<String> id) {
+        if(id==null||id.size()==0){
+            return new ArrayList<>();
+        }
         final List<Question> questions = questionRepository.findAllByIdIn(id);
         return questions;
     }