修复动态表单列表为空时的报错

shandan-basedata/src/main/java/com/keyware/shandan/dynacmicform/controller/DynamicDataController.java

@@ -105,6 +105,7 @@ public class DynamicDataController {
     @GetMapping("/view/data/list/")
     public ModelAndView dataListView(ModelAndView mav) {
         mav.addObject("formInfo", new FormInfoPo());
+        mav.addObject("preview", false);
         mav.setViewName("dynamicData/dataList");
         return mav;
     }