作业发布者真名为空时，显示昵称

public/assets/wechat/homework_detail.html

@@ -6,7 +6,9 @@
                 <div class="post-title mb5"><span class="c-grey3 f15 fb">{{homework.name}}</span></div>
                 <table class="post-detail-info"><tr>
                     <td class="text-nowrap v-top">发布者：</td>
-                    <td>{{homework.author.realname}}</td>
+                    <td>
+                        <span ng-if="homework.author.realname != ' '">{{homework.author.realname}}</span>
+                        <span ng-if="homework.author.realname == ' '">{{homework.author.nickname}}</span></td>
                 </tr>
                     <tr>
                         <td class="text-nowrap v-top">来&nbsp;&nbsp;&nbsp;源：</td>