Fix route presenter regression: include options: {} when empty

The INTERNAL_ROUTE_OPTIONS filtering change incorrectly suppressed
the options key entirely when public_options was empty. The original
behavior includes options whenever route.options is not nil, even
when the hash is empty.

Author: rkoster

app/presenters/v3/route_presenter.rb

@@ -50,7 +50,7 @@ def to_hash
       }
       unless route.options.nil?
         public_options = route.options.reject { |k, _| INTERNAL_ROUTE_OPTIONS.include?(k.to_s) }
-        hash.merge!(options: public_options) unless public_options.empty?
+        hash.merge!(options: public_options)
       end
 
       @decorators.reduce(hash) { |memo, d| d.decorate(memo, [route]) }