[refs #758] add default branch validation

app/models/project.rb

@@ -30,6 +30,7 @@ class Project < ActiveRecord::Base
   validates :maintainer_id, :presence => true, :unless => :new_record?
   validates :visibility, :presence => true, :inclusion => {:in => VISIBILITIES}
   validate { errors.add(:base, :can_have_less_or_equal, :count => MAX_OWN_PROJECTS) if owner.projects.size >= MAX_OWN_PROJECTS }
+  validate { errors.add(:default_branch, I18n.t('activerecord.errors.project.default_branch')) unless self.repo.branches.map(&:name).include?(self.default_branch) }
 
   attr_accessible :name, :description, :visibility, :srpm, :is_package, :default_branch, :has_issues, :has_wiki, :maintainer_id
   attr_readonly :name, :owner_id, :owner_type

config/locales/models/project.en.yml

@@ -99,3 +99,4 @@ en:
     errors:
       project:
         uname: The name can only use lower case Latin letters (a-z), numbers (0-9) and underscore (_)
+        default_branch: Wrong branch

config/locales/models/project.ru.yml

@@ -99,3 +99,4 @@ ru:
     errors:
       project:
         uname: В имени можно использовать только строчные символы латинского алфавита (a-z), цифры (0-9) и символ нижнего подчеркивания (_)
+        default_branch: Указана несуществующая ветка