fix(components): [el-tree-v2] empty-text supports empty string & virtual list width become no required (#4144)

packages/components/tree-v2/src/tree-node.vue

@@ -80,7 +80,7 @@ export default defineComponent({
     })
 
     const icon = computed(() => {
-      return tree?.props.icon ? tree.props.icon : DEFAULT_ICON
+      return tree?.props.icon ?? DEFAULT_ICON
     })
 
     const handleClick = () => {

packages/components/tree-v2/src/tree.vue

@@ -35,7 +35,7 @@
     </fixed-size-list>
     <div v-else class="el-tree__empty-block">
       <span class="el-tree__empty-text">{{
-        emptyText || t('el.tree.emptyText')
+        emptyText ?? t('el.tree.emptyText')
       }}</span>
     </div>
   </div>

packages/components/virtual-list/src/props.ts

@@ -88,7 +88,7 @@ export const virtualizedProps = buildProps({
 
   width: {
     type: [Number, String],
-    required: true,
+    required: false,
   },
 
   perfMode: {