ENH: Gracefully handle case with no title

docs/specimen.rst

@@ -390,3 +390,8 @@ Right Alignment
     :alt: Right Image, 60% scale
     :scale: 60%
     :align: right
+
+
+Links
+-----
+This is a link to a page with no title: :ref:`No Title`.

sphinx_material/__init__.py

@@ -1,6 +1,7 @@
 """Sphinx Material theme."""
 
 import hashlib
+import html
 import inspect
 import os
 import re
@@ -301,4 +302,4 @@ def __new__(cls, *args, **kwargs):
 
 
 def get_html_context():
-    return {"table_fix": TableFix, "derender_toc": DerenderToc}
+    return {"table_fix": TableFix, "derender_toc": DerenderToc, "unescape": html.unescape}

sphinx_material/sphinx_material/layout.html

@@ -51,7 +51,14 @@
   {% if theme_touch_icon %}
     <link rel="apple-touch-icon" href="{{ pathto('_static/' ~ theme_touch_icon, 1) }}"/>
   {% endif %}
-  {{ super() }}
+  <title>
+    {% if "no title" in title or not title.strip() %}
+    {% set ts = unescape(titlesuffix).strip()[1:].strip() %}
+      {{ ts|e }}
+    {% else %}
+      {{ title|striptags|e }}{{ titlesuffix }}
+    {% endif %}
+  </title>
 {%- endblock %}
 
 {%- block extrahead %}