Guard against type error in absolute url (#6280)

Merge pull request 6280

lib/jekyll/filters/url_filters.rb

@@ -12,9 +12,9 @@ module Jekyll
       # Returns the absolute URL as a String.
       def absolute_url(input)
         return if input.nil?
-        return input if Addressable::URI.parse(input).absolute?
+        return input if Addressable::URI.parse(input.to_s).absolute?
         site = @context.registers[:site]
-        return relative_url(input).to_s if site.config["url"].nil?
+        return relative_url(input) if site.config["url"].nil?
         Addressable::URI.parse(
           site.config["url"].to_s + relative_url(input)
         ).normalize.to_s

test/test_filters.rb

@@ -440,6 +440,10 @@ class TestFilters < JekyllUnitTest
         filter = make_filter_mock({ "url" => Value.new(proc { "http://example.org" }) })
         assert_equal "http://example.org#{page_url}", filter.absolute_url(page_url)
       end
+
+      should "not raise a TypeError when passed a hash" do
+        assert @filter.absolute_url({ "foo" => "bar" })
+      end
     end
 
     context "relative_url filter" do