Add fallback section ID with ToC (mastodon#11941)

Author: ykzts

app/lib/toc_generator.rb

@@ -45,7 +45,7 @@ def parse_and_transform
     parsed_html.traverse do |node|
       next unless TARGET_ELEMENTS.include?(node.name)
 
-      anchor = node['id'] || node.text.parameterize
+      anchor = node['id'] || node.text.parameterize.presence || 'sec'
       @slugs[anchor] += 1
       anchor = "#{anchor}-#{@slugs[anchor]}" if @slugs[anchor] > 1