VRFS-3957 fixed cryptic sql query bug in UserBlacklist#banned

ruby/lib/jam_ruby/models/user_blacklist.rb

@@ -11,7 +11,7 @@ module JamRuby
     validates_uniqueness_of :user_id
 
     def self.banned(user)
-      UserBlacklist.count(:conditions => "user_id = '#{user.id}' AND user_id not in (select user_id from user_whitelists where user_id = '#{user.id}')") == 1
+      UserBlacklist.count(:conditions => "user_id = '#{user.id}' AND user_id NOT IN (SELECT white.user_id FROM user_whitelists white WHERE white.user_id = '#{user.id}')") >= 1
     end
 
     def self.listed(user)
@@ -30,4 +30,4 @@ module JamRuby
       user
     end
   end
-end
+end