问卷修改bugfix

rc-admin/src/main/java/com/ruoyi/web/controller/rc/TQuestionnaireController.java

@@ -88,7 +88,7 @@ public class TQuestionnaireController extends BaseController
     {
         TQuestionnaire tQuestionnaire = tQuestionnaireService.selectTQuestionnaireById(id);
         String year = tQuestionnaire.getYear();
-        if (year.length() > 4) {
+        if (StringUtils.isNotEmpty(year) && !"".equals(year) && year.length() > 4) {
             tQuestionnaire.setYear(year.substring(0, year.indexOf("-")));
         }
         return success(tQuestionnaire);