Update application_helper.rb

Author: lmrodriguezr

app/helpers/application_helper.rb

@@ -252,7 +252,11 @@ def modal(title, opts = {})
                 end
             end +
             content_tag(:div, class: opts[:body_class]) do
-              yield if block_given?
+              if block_given?
+                yield
+              elsif opts[:async]
+                fa_icon(:spinner, class: 'fa-spin') + ' Loading...'
+              end
             end +
             if opts[:footer]
               content_tag(:div, opts[:footer], class: 'modal-footer')