Footers should have a nil #footer.

lib/gollum/page.rb

@@ -152,6 +152,8 @@ module Gollum
     #
     # Returns the footer Page or nil if none exists.
     def footer
+      return nil if page_match('_Footer', self.name)
+
       dirs = self.path.split('/')
       dirs.pop
       while !dirs.empty?

test/test_page.rb

@@ -92,4 +92,9 @@ context "Page" do
     assert_equal "Ones does not simply **walk** into Mordor!\n", footer.raw_data
     assert_equal "Mordor/_Footer.md", footer.path
   end
+
+  test "footer itself" do
+    footer = @wiki.page("_Footer")
+    assert_nil footer.footer
+  end
 end