Disable link to the storage page if it doesn't exist

bin/dashboard

@@ -116,12 +116,20 @@ def render(packaging_data, storage_data, destdir):
     env = jinja2.Environment(
         loader=jinja2.FileSystemLoader("templates/"), autoescape=True
     )
+
+    if packaging_data is not None and storage_data is not None:
+        both_data = True
+    else:
+        both_data = False
+
     for html, data in ("index", packaging_data), ("storage", storage_data):
         if data is None:
             continue
 
         logging.debug(f"Generating {destdir}/{html}.html")
-        rendered = env.get_template(f"{html}.html.jinja2").render(**data)
+        rendered = env.get_template(f"{html}.html.jinja2").render(
+            **data, both_data=both_data
+        )
         with open(destdir / f"{html}.html", "w") as html_file:
             html_file.write(rendered)