client/posts: display edit link for tagless posts

client/html/post_readonly_sidebar.tpl

@@ -62,6 +62,7 @@
 
     <nav class='tags'>
         <h1>Tags (<%- ctx.post.tags.length %>)</h1>
+        <% if (ctx.post.tags.length) { %>
             <ul><!--
                 --><% for (let tag of ctx.post.tags) { %><!--
                     --><li><!--
@@ -83,5 +84,13 @@
                     --></li><!--
                 --><% } %><!--
             --></ul>
+        <% } else { %>
+            <p>
+                No tags yet!
+                <% if (ctx.canEditPosts) { %>
+                    <a href='<%= ctx.getPostEditUrl(ctx.post.id, ctx.parameters) %>'>Add some.</a>
+                <% } %>
+            </p>
+        <% } %>
     </nav>
 </div>

client/js/controls/post_readonly_sidebar_control.js

@@ -24,6 +24,7 @@ class PostReadonlySidebarControl extends events.EventTarget {
             getTagCategory: this._getTagCategory,
             getTagUsages: this._getTagUsages,
             canListPosts: api.hasPrivilege('posts:list'),
+            canEditPosts: api.hasPrivilege('posts:edit'),
             canViewTags: api.hasPrivilege('tags:view'),
         }));