Add time to announcement quick edit

Fix picture for news quick edit
Fix tags not saving when empty
Hide role in quick edit

app/models/asset.rb

@@ -18,8 +18,16 @@ class Asset
   belongs_to :assetable, polymorphic: true
   has_and_belongs_to_many :tags, :class_name => "AssetTag"
 
+  before_save :clean_tags
+
   def sorted_tags
     tags.order_by(I18n.locale, :asc)
   end
+
+  protected
+
+  def clean_tags
+    self.tag_ids.delete('')
+  end
   
 end