Fix how 'notable trait' sections were displayed

- Fix error in reference/introduction.html while scraping

lib/docs/filters/rust/clean_html.rb

@@ -97,6 +97,22 @@ module Docs
           node.previous_element.before(node)
         end
 
+        css('.collapse-toggle').remove
+
+        # Fix how notable-traits sections are shown
+
+        css('.method').each do |node|
+          traitSection = node.at_css('.notable-traits')
+
+          if traitSection
+            traitSectionContent = traitSection.css('.notable-traits-tooltiptext')
+            traitSection.css('.notable-traits-tooltip').remove
+            traitSection.add_child(traitSectionContent)
+            node.after(traitSection)
+          end
+
+        end
+
         doc
       end
     end

lib/docs/filters/rust/entries.rb

@@ -1,9 +1,11 @@
 module Docs
   class Rust
     class EntriesFilter < Docs::EntriesFilter
+
       def get_name
         if slug.start_with?('book') || slug.start_with?('reference')
-          at_css("#sidebar a[href='#{File.basename(slug)}']").content
+          name = at_css("#sidebar a[href='#{File.basename(slug)}']")
+          name ? name.content : 'Introduction'
         elsif slug == 'error-index'
           'Compiler Errors'
         else
@@ -51,6 +53,7 @@ module Docs
             }.values
         end
       end
+
     end
   end
 end