Fix error when @option with non-method

spec/templates/tag_spec.rb

@@ -49,4 +49,16 @@ module Foo; end
         .not_to raise_error
     end
   end
+
+  describe "option tags on non-methods" do
+    it "does not display @option tags on non-method objects" do
+      YARD.parse_string <<-'eof'
+        # @option opts name [#to_s] ('bar') the name
+        module Foo; end
+      eof
+
+      expect { Registry.at('Foo').format(html_options) }
+        .not_to raise_error
+    end
+  end
 end

templates/default/tags/html/option.erb

@@ -1,4 +1,4 @@
-<% if object.has_tag?(:option) %>
+<% if object.has_tag?(:option) && object.respond_to?(:parameters) %>
   <% object.parameters.each do |param, default| %>
     <% tags = object.tags(:option).select {|x| x.name.to_s == param.to_s.sub(/^\*+|:$/, '') } %>
     <% next if tags.empty? %>