fix: 菜单图标字段 null 值守卫，补丁版本号 4.8.1

package.json

@@ -1,12 +1,12 @@
-{
+{
     "name":  "vue3-element-admin",
     "description":  "Vue3 + Vite + TypeScript + Element-Plus 的后台管理模板，vue-element-admin 的 Vue3 版本",
-  "version": "4.8.0",
+    "version":  "4.8.1",
     "private":  true,
     "type":  "module",
     "scripts":  {
                     "dev":  "vite",
-    "build": "vue-tsc --noEmit && vite build",
+                    "build":  "vue-tsc --noEmit \u0026\u0026 vite build",
                     "preview":  "vite preview",
                     "build-only":  "vite build",
                     "type-check":  "vue-tsc --noEmit",
@@ -14,7 +14,7 @@
                     "lint:prettier":  "prettier --write \"**/*.{js,cjs,ts,json,css,scss,vue,html,md}\"",
                     "lint:stylelint":  "stylelint --cache \"**/*.{css,scss,vue}\" --fix",
                     "lint:lint-staged":  "lint-staged",
-    "lint": "npm run lint:eslint && npm run lint:prettier && npm run lint:stylelint",
+                    "lint":  "npm run lint:eslint \u0026\u0026 npm run lint:prettier \u0026\u0026 npm run lint:stylelint",
                     "preinstall":  "npx only-allow pnpm",
                     "prepare":  "husky",
                     "commit":  "git-cz",
@@ -121,7 +121,7 @@
                             "vue-tsc":  "^3.3.5"
                         },
     "engines":  {
-    "node": "^20.19.0 || >=22.12.0"
+                    "node":  "^20.19.0 || \u003e=22.12.0"
                 },
     "repository":  "https://gitee.com/youlaiorg/vue3-element-admin.git",
     "author":  "有来开源组织",

src/layouts/components/LayoutMenuIcon.vue

@@ -15,7 +15,7 @@ const props = withDefaults(
   }
 );
 
-const isElementIcon = computed(() => props.icon.startsWith("el-icon"));
-const elementIconName = computed(() => props.icon.replace("el-icon-", ""));
+const isElementIcon = computed(() => (props.icon || "").startsWith("el-icon"));
+const elementIconName = computed(() => (props.icon || "").replace("el-icon-", ""));
 const svgIconClass = computed(() => `i-svg:${props.icon || "menu"}`);
 </script>