print errors to STDERR, and exit abnormally

Author: amatsuda

bin/import_mails

@@ -1,5 +1,6 @@
 #!/usr/bin/env ruby
 
+require 'pp'
 require 'optparse'
 require 'mail'
 require 'mail/encodings/x_gzip64'
@@ -57,4 +58,7 @@ Message.transaction do
   end
 end
 
-pp errors if errors.any?
+if errors.any?
+  PP.pp errors, STDERR
+  exit 1
+end