Don't filter out intentionally empty hashes from transformed props

Author: bknoles

lib/inertia_rails/renderer.rb

@@ -105,7 +105,7 @@ def deep_transform_props(props, parent_path = [], &block)
       props.reduce({}) do |transformed_props, (key, prop)|
         current_path = parent_path + [key]
 
-        if prop.is_a?(Hash)
+        if prop.is_a?(Hash) && prop.any?
           nested = deep_transform_props(prop, current_path, &block)
           transformed_props.merge!(key => nested) unless nested.empty?
         else

spec/dummy/app/controllers/inertia_render_test_controller.rb

@@ -40,6 +40,7 @@ def deeply_nested_props
           first: 'first deeply nested param',
           second: false,
           what_about_nil: nil,
+          what_about_empty_hash: {},
           deeply_nested_always: InertiaRails.always { 'deeply nested always prop' },
           deeply_nested_lazy: InertiaRails.lazy { 'deeply nested lazy prop' }
         }

spec/inertia/rendering_spec.rb

@@ -116,7 +116,7 @@
       let(:headers) do
         {
           'X-Inertia' => true,
-          'X-Inertia-Partial-Data' => 'nested.first,nested.deeply_nested.second,nested.deeply_nested.what_about_nil',
+          'X-Inertia-Partial-Data' => 'nested.first,nested.deeply_nested.second,nested.deeply_nested.what_about_nil,nested.deeply_nested.what_about_empty_hash',
           'X-Inertia-Partial-Component' => 'TestComponent',
         }
       end
@@ -131,6 +131,7 @@
             'deeply_nested' => {
               'second' => false,
               'what_about_nil' => nil,
+              'what_about_empty_hash' => {},
               'deeply_nested_always' => 'deeply nested always prop',
             },
           },