Wrap all feed tags in conditions

layouts/_default/list.atom.xml

@@ -60,7 +60,9 @@
         <icon>{{ . }}</icon>
     {{ end }}
 
-    <id>{{ $id }}</id>
+    {{ with $id }}
+        <id>{{ . }}</id>
+    {{ end }}
 
     {{ range $page.OutputFormats }}
         {{ $rel := cond (eq .Rel "canonical") "self" .Rel }}
@@ -86,9 +88,13 @@
         <subtitle type="html"><![CDATA[{{ . }}]]></subtitle>
     {{ end }}
 
-    <title type="html"><![CDATA[{{ $title }}]]></title>
+    {{ with $title }}
+        <title type="html"><![CDATA[{{ . }}]]></title>
+    {{ end }}
 
-    <updated>{{ $lastmod }}</updated>
+    {{ with $lastmod }}
+        <updated>{{ . }}</updated>
+    {{ end }}
 
     {{ range $subpages }}
         {{ $include := not (.Param "paige.exclude_feeds") }}
@@ -139,7 +145,9 @@
                     <content type="html"><![CDATA[{{ . }}]]></content>
                 {{ end }}
 
-                <id>{{ $id }}</id>
+                {{ with $id }}
+                    <id>{{ . }}</id>
+                {{ end }}
 
                 {{ range .OutputFormats }}
                     {{ $rel := cond (eq .Rel "canonical") "self" .Rel }}
@@ -171,7 +179,9 @@
                     <title type="html"><![CDATA[{{ . }}]]></title>
                 {{ end }}
 
-                <updated>{{ $lastmod }}</updated>
+                {{ with $lastmod }}
+                    <updated>{{ . }}</updated>
+                {{ end }}
             </entry>
         {{ end }}
     {{ end }}

layouts/_default/list.rss.xml

@@ -56,7 +56,9 @@
             <copyright>{{ . }}</copyright>
         {{ end }}
 
-        <description>{{ $description }}</description>
+        {{ with $description }}
+            <description>{{ . }}</description>
+        {{ end }}
 
         {{ with $language }}
             <language>{{ . }}</language>
@@ -66,13 +68,17 @@
             <lastBuildDate>{{ . }}</lastBuildDate>
         {{ end }}
 
-        <link>{{ $link }}</link>
+        {{ with $link }}
+            <link>{{ . }}</link>
+        {{ end }}
 
         {{ with $editor }}
             <managingEditor>{{ . }}</managingEditor>
         {{ end }}
 
-        <title>{{ $title }}</title>
+        {{ with $title }}
+            <title>{{ . }}</title>
+        {{ end }}
 
         {{ with $master }}
             <webMaster>{{ . }}</webMaster>
@@ -126,7 +132,9 @@
                         <description><![CDATA[{{ . }}]]></description>
                     {{ end }}
 
-                    <guid isPermaLink="false">{{ $guid }}</guid>
+                    {{ with $guid }}
+                        <guid isPermaLink="false">{{ . }}</guid>
+                    {{ end }}
 
                     {{ with $link }}
                         <link>{{ . }}</link>