fix rescuing LoadError twice

Author: manuelmeurer

Rakefile

@@ -49,9 +49,11 @@ task :debug do
   begin
     require 'dartsass-ruby'
   rescue LoadError
-    require 'sassc'
-  rescue LoadError
-    raise LoadError.new("bootstrap-rubygem requires a Sass engine. Please add dartsass-sprockets or sassc-rails to your dependencies.")
+    begin
+      require 'sassc'
+    rescue LoadError
+      raise LoadError.new("bootstrap-rubygem requires a Sass engine. Please add dartsass-sprockets or sassc-rails to your dependencies.")
+    end
   end
   require './lib/bootstrap'
   require 'term/ansicolor'

lib/bootstrap/engine.rb

@@ -4,9 +4,11 @@
 begin
   require 'dartsass-sprockets'
 rescue LoadError
-  require 'sassc-rails'
-rescue LoadError
-  raise LoadError.new("bootstrap-rubygem requires a Sass engine. Please add dartsass-sprockets or sassc-rails to your dependencies.")
+  begin
+    require 'sassc-rails'
+  rescue LoadError
+    raise LoadError.new("bootstrap-rubygem requires a Sass engine. Please add dartsass-sprockets or sassc-rails to your dependencies.")
+  end
 end
 
 module Bootstrap