fix:顶部导航显示

src/forge/Head/Header.js

@@ -310,11 +310,15 @@ class NewHeader extends Component {
   }
 
   checkLink=(link)=>{
-    let { settings,} = this.state;
-    if(link && link.indexOf("http")>-1){
-      return link;
-    }else{
-      return settings.new_course.default_url + link;
+    let { settings, } = this.state;
+    if (link) {
+      if (link.indexOf("http") > -1) {
+        return link;
+      } else {
+        return settings.new_course.default_url + link;
+      }
+    } else {
+      return ''
     }
   }
 
@@ -441,7 +445,7 @@ class NewHeader extends Component {
               <ul id="header-nav">
                 {
                   settings.navbar && settings.navbar.map((item, key) => {
-                    if (!item.link) return;
+                    // if (!item.link) return;
                     
                     var new_link = item.link;
                     var user_login = this.props.user && this.props.user.login;