Fix fb share, redirect with js when the page is not requested by fb but by user

app/views/shared/render_share.html.erb

@@ -3,8 +3,12 @@
 <head>
 	<meta property="og:title" content="<%= @object.title %>" /> 
 	<meta property="og:description" content="<%= strip_tags @object.subtitle %>" /> 
-	<meta property="og:url" content="<%= @orig_url %>" /> 
-	<meta property="og:image" content="<%= 'http://' + request.env['HTTP_HOST'] + @object.image.url %>" />
+	<meta property="og:image" content="<%= ('http://' + request.env['HTTP_HOST'] + @object.image.url) unless @object.image.blank? %>" />
+	<script type="text/javascript">
+		<!--
+		window.location = "<%= @orig_url %>"
+		//-->
+	</script>
 </head>
 <body>
 </body>