perf: 修复dialog 不能滚动问题

perf: 去掉debug

src/components/FormFields/Select2.vue

@@ -114,7 +114,7 @@ export default {
     },
     iValue: {
       set(val) {
-        if (!val) {
+        if (!val || val.length === 0) {
           return
         }
         this.$emit('input', val)

src/styles/element-ui.scss

@@ -458,9 +458,3 @@ a {
 .el-table-filter__list-item:hover {
   color: $--color-text-primary;
 }
-
-.el-dialog__wrapper {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-}