Fix if defined? conditional for R2

lib/sass/discourse_sass_compiler.rb

@@ -66,13 +66,11 @@ class DiscourseSassCompiler
     # Check if CSS needs to be RTLed after compilation
     # and run R2 gem on compiled CSS if true and R2 gem is available
     css_output = css
-    if defined?(R2)
-      if !SiteSetting.allow_user_locale && SiteSetting.default_locale.in?(%w(he ar fa_IR))
-        begin
-          require 'r2'
-          css_output = R2.r2(css)
-        rescue; end
-      end
+    if !SiteSetting.allow_user_locale && SiteSetting.default_locale.in?(%w(he ar fa_IR))
+      begin
+        require 'r2'
+        css_output = R2.r2(css) if defined?(R2)
+      rescue; end
     end
     css_output
   end