ENH: Use toctree titles in the header navbar (#915)

src/pydata_sphinx_theme/__init__.py

@@ -238,16 +238,17 @@ def generate_header_nav_html(n_links_before_dropdown=5):
 
         # Find the root document because it lists our top-level toctree pages
         root = app.env.tocs[app.config.root_doc]
+
         # Iterate through each toctree node in the root document
         # Grab the toctree pages and find the relative link + title.
         links_html = []
         # Can just use "findall" once docutils min version >=0.18.1
         meth = "findall" if hasattr(root, "findall") else "traverse"
         for toc in getattr(root, meth)(toctree_node):
-            for _, page in toc.attributes["entries"]:
+            for title, page in toc.attributes["entries"]:
                 # If this is the active ancestor page, add a class so we highlight it
                 current = " current active" if page == active_header_page else ""
-                title = app.env.titles[page].astext()
+                title = title if title else app.env.titles[page].astext()
                 links_html.append(
                     f"""
                 <li class="nav-item{current}">