E-book viewer: Allow entries in the Table of Contents that do not point anywhere, instead of just ignoring them.

src/calibre/ebooks/metadata/toc.py

@@ -194,8 +194,7 @@ class TOC(list):
                 content = content_path(np)
                 if content and text:
                     content = content[0]
-                    src = get_attr(content, attr='src')
-                    if src:
+                    # if get_attr(content, attr='src'):
                     purl = urlparse(content.get('src'))
                     href, fragment = unquote(purl[2]), unquote(purl[5])
                     nd = dest.add_item(href, fragment, text)

src/calibre/gui2/viewer/toc.py

@@ -56,7 +56,7 @@ class TOCItem(QStandardItem):
         self.title = text
         self.parent = parent
         QStandardItem.__init__(self, text if text else '')
-        self.abspath = toc.abspath
+        self.abspath = toc.abspath if toc.href else None
         self.fragment = toc.fragment
         all_items.append(self)
         self.bold_font = QFont(self.font())
@@ -70,11 +70,13 @@ class TOCItem(QStandardItem):
             if si == self.abspath:
                 spos = i
                 break
+        am = {}
+        if self.abspath is not None:
             try:
                 am = getattr(spine[i], 'anchor_map', {})
             except UnboundLocalError:
                 # Spine was empty?
-            am = {}
+                pass
         frag = self.fragment if (self.fragment and self.fragment in am) else None
         self.starts_at = spos
         self.start_anchor = frag