[meta] Fix up firehose feed

layouts/section/posts.rss.xml

@@ -10,7 +10,11 @@
     <copyright>{{.}}</copyright>{{end}}{{ if not .Date.IsZero }}
     <lastBuildDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
     <atom:link href="{{.Permalink}}" rel="self" type="application/rss+xml" />
-    {{ range $items := (where .Site.Pages "Params.type" "in" .Params.types).ByDate.Reverse }}
+    {{- $items := (where (where .Site.Pages "Section" "posts") "Type" "!=" "posts").ByDate.Reverse  }}
+    {{- if .Params.types }}
+    {{- $items = (where .Site.Pages "Params.type" "in" .Params.types).ByDate.Reverse -}}
+    {{ end -}}
+    {{ range $items }}
     <item>
       <title>{{ .Title }}</title>
       <link>{{ .Permalink }}</link>
@@ -19,7 +23,7 @@
       <guid>{{ .Permalink }}</guid>
       <description>{{ .Content | html }}</description>
     </item>
-    {{ end }}
+    {{- end }}
   </channel>
 </rss>