include partials if they exist given theme

blog/layouts/_default/single.html

@@ -11,13 +11,17 @@
         <header class="post-header">
             <h1 class="p-name post-title{{ if .Params.favorite }} favorite{{end}}{{ if .Params.draft }} draft{{end}}">{{ trim .Title  " " }}</h1>
 
+            {{ if templates.Exists "partials/theme-switcher.html" }}
                 {{ partial "post-language-switcher.html" . }}
+            {{ end }}
         </header>
         {{ partial "post-toc.html" . }}
         <div class="content e-content">
             {{ .Content }}
         </div>
+        {{ if templates.Exists "partials/post-info.html" }}
             {{ partial "post-info.html" . }}
+        {{ end }}
     </article>
 
     {{ if and (.Site.Params.paginationSinglePost) (ne .Type "page") }}

blog/layouts/partials/footer.html

@@ -24,8 +24,12 @@
             </p>
         </div>
 
+        {{ if templates.Exists "partials/theme-switcher.html" }}
             {{ partial "theme-switcher.html" . }}
+        {{ end }}
     </div>
 
+    {{ if templates.Exists "partials/h-card.html" }}
         {{ partial "h-card.html" . }}
+    {{ end }}
 </footer>

meta/config.yaml

@@ -13,6 +13,7 @@ rssLimit: 5
 canonifyurls: true
 relativeurls: false
 params:
+  layout: "1"
   toc: true
   author: bel
   email: bel@bel.bel