code cleanup: rubocop: fix Style/ZeroLengthPredicate in app/models/issue.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@18523 e93f8b46-1217-0410-a6f0-8f06a7374b81

.rubocop_todo.yml

@@ -1726,7 +1726,6 @@ Style/WordArray:
 Style/ZeroLengthPredicate:
   Exclude:
     - 'app/models/import.rb'
-    - 'app/models/issue.rb'
     - 'app/models/mail_handler.rb'
     - 'app/models/user.rb'
     - 'lib/redmine/field_format.rb'

app/models/issue.rb

@@ -77,7 +77,7 @@ class Issue < ActiveRecord::Base
   }
 
   scope :open, lambda {|*args|
-    is_closed = args.size > 0 ? !args.first : false
+    is_closed = !args.empty? ? !args.first : false
     joins(:status).
     where(:issue_statuses => {:is_closed => is_closed})
   }