fix(blog): guard against deleted authors

Author: themightychris

html-templates/blog/blogPost.tpl

@@ -17,7 +17,9 @@
 
     <meta property="article:published_time" content="{date($.const.DATE_W3C, $Post->Published)}" />
 
-    <meta property="article:author" content="{absolute_url $Post->Author->getURL()}" />
+    {if $Post->Author}
+        <meta property="article:author" content="{absolute_url $Post->Author->getURL()}" />
+    {/if}
 
     <meta name="twitter:card" content="summary" />
     <meta name="twitter:title" content="{$Post->Title|escape}" />

html-templates/subtemplates/blog.tpl

@@ -11,7 +11,9 @@
             {if $showHeader}
                 <header class="post-header">
                     <{$headingLevel} class="post-title">
-                        <a class="pull-right" href="{$Post->Author->getURL()}" data-toggle="tooltip" title="{personName $Post->Author}">{avatar $Post->Author size=64}</a>
+                        {if $Post->Author}
+                            <a class="pull-right" href="{$Post->Author->getURL()}" data-toggle="tooltip" title="{personName $Post->Author}">{avatar $Post->Author size=64}</a>
+                        {/if}
                         <a href="{$Post->getURL()}">{$Post->Title|escape}</a>
                     </{$headingLevel}>
                 </header>