bugfix:修复菜单未设置icon时，vue会弹出vnode警告的bug； #914
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Stephen-Z
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bugfix:修复菜单未设置icon时，vue会弹出vnode警告的bug；
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菜单的icon本身为可选项，但未设置菜单的icon时，vue会发出警告：
Invalid vnode type when creating vnode: . at
这是由于routerInfo.meta.icon为空时，将空字符串交由el-icon去渲染图标导致的。现用v-if指令避免这种情况发生。