Fix link in structure when the item is a link

Add internal links creation

app/models/link.rb

@@ -2,7 +2,7 @@ class Link < Item
   
   field :url
   
-  validates :url, :presence => true, :format => /^(http|https):\/\/(([a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5})|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(:[0-9]{1,5})?(\/.*)?/i
+  validates :url, :presence => true, :format => /^(http|https):\/\/(([a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5})|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))|localhost(:[0-9]{1,5})?(\/.*)?/i
 
 	before_validation :add_http
 
@@ -13,7 +13,7 @@ class Link < Item
   protected
 
 	def add_http
-	  unless self.url[/^http:\/\//] || self.url[/^https:\/\//]
+	  unless self.url[/^(http|https):\/\//] || self.url.blank?
 	    self.url = 'http://' + self.url
 	  end
 	end