Fix default theme page title (#47)

src/default-theme/layout.liquid

@@ -4,7 +4,7 @@
   <meta name=viewport content="width=device-width">
   <link rel=stylesheet href=https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css
         integrity=sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3 crossorigin=anonymous>
-  <title>{{ page_title | strip_html }}{% if page_title %} &laquo; {% endif %}{{ web_log.name | strip_html }}</title>
+  <title>{{ page_title | strip_html }}{% if page_title <> "" %} &laquo; {% endif %}{{ web_log.name | strip_html }}</title>
   {% page_head -%}
   <header>
     <nav class="navbar navbar-light bg-light navbar-expand-md justify-content-start px-2">
@@ -41,7 +41,7 @@
         {% endfor %}
       </div>
     {% endif %}
-    {{ content }}  
+    {{ content }}
   </main>
   <footer>
     <hr>