Fix empty children rendering bug in Rails 7.1. Because our children e…

…xplicitly concat on @output_buffer, we should not return anything from capture block. This used to work anyway on Rails <7.1 but it no longer works

lib/rbexy/configuration.rb

@@ -21,7 +21,7 @@ def transforms
 
     def component_rendering_templates
       @component_rendering_templates ||= {
-        children: "{capture{%{children}}}",
+        children: "{capture{%{children};nil}}",
         component: "::%{component_class}.new(%{view_context},%{kwargs}).render_in%{children_block}"
       }
     end