wiki pages: fix error in new controller action.

app/models/wiki_page.rb

@@ -166,7 +166,7 @@ class WikiPage < ApplicationRecord
   end
 
   def self.is_meta_wiki?(title)
-    title.starts_with?(*META_WIKIS)
+    title.present? && title.starts_with?(*META_WIKIS)
   end
 
   def is_meta_wiki?

test/functional/wiki_pages_controller_test.rb

@@ -92,6 +92,11 @@ class WikiPagesControllerTest < ActionDispatch::IntegrationTest
         get_auth new_wiki_page_path, @mod, params: { wiki_page: { title: "test" }}
         assert_response :success
       end
+
+      should "render without a title" do
+        get_auth new_wiki_page_path, @mod
+        assert_response :success
+      end
     end
 
     context "edit action" do