fixed bug when no version is selected in projects/add_file

git-svn-id: http://redmine.rubyforge.org/svn/trunk@97 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/attachment.rb

@@ -21,7 +21,7 @@ class Attachment < ActiveRecord::Base
   belongs_to :container, :polymorphic => true
   belongs_to :author, :class_name => "User", :foreign_key => "author_id"
   
-	validates_presence_of :filename
+  validates_presence_of :container, :filename
 	
 	def file=(incomming_file)
 		unless incomming_file.nil?
@@ -35,6 +35,10 @@ class Attachment < ActiveRecord::Base
 		end
 	end
 	
+	def file
+	 nil
+	end
+	
 	# Copy temp file to its final location
 	def before_save
 		if @temp_file && (@temp_file.size > 0)