add space after comma to app/models/mail_handler.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@20115 e93f8b46-1217-0410-a6f0-8f06a7374b81

Author: marutosi

app/models/mail_handler.rb

@@ -524,7 +524,7 @@ def cleaned_up_text_body
 
   def cleaned_up_subject
     subject = email.subject.to_s
-    subject.strip[0,255]
+    subject.strip[0, 255]
   end
 
   def self.assign_string_attribute_with_limit(object, attribute, value, limit=nil)