Fix toc display by removing the title

Title was displayed in the table of content, we do not want this
behaviour. The plugin has been directly modified in order to fix
that.

plugins/pelican-toc/toc.py

@@ -77,7 +77,7 @@ class HtmlTreeNode(object):
 
     def __str__(self):
         ret = "<a class='toc-href' href='#{0}' title='{1}'>{1}</a>".format(
-                self.id, self.header)
+                self.id, self.header) if self.header else ""
 
         if self.children:
             ret += "<ul>{}</ul>".format('{}'*len(self.children)).format(
@@ -116,7 +116,7 @@ def generate_toc(content):
 
     all_ids = set()
     title = content.metadata.get('title', 'Title')
-    tree = node = HtmlTreeNode(None, title, 'h0', '')
+    tree = node = HtmlTreeNode(None, '', 'h0', '')
     soup = BeautifulSoup(content._content, 'html.parser')
     settoc = False