Handle nil description, not_found case

app/assets/javascripts/search.coffee

@@ -38,6 +38,9 @@ class window.Search
       else if data.status == 'fail'
         _search.hideSpinner()
         _page.print data.html
+      else if data.status == 'not_found'
+        _search.hideSpinner()
+        alert "Not found"
     false
   
   showSuggestions: (values) ->

app/models/music/artist.rb

@@ -11,6 +11,6 @@ class Artist < ActiveRecord::Base
   end
   
   def prepare_description
-    self.desc.gsub! /[\[<].*?[\]>]/, ''
+    self.desc.gsub! /[\[<].*?[\]>]/, '' unless self.desc.nil?
   end
 end