Vanity fails to set identify_block on high load

[dziulius]

When load is very high, we randomly get
undefined method `call' for nil:NilClass
error

/usr/local/lib/ruby/gems/1.8/gems/vanity-1.2.0/lib/vanity/experiment/base.rb:108:in `identity'

/usr/local/lib/ruby/gems/1.8/gems/vanity-1.2.0/lib/vanity/experiment/ab_test.rb:190:in `choose'

/usr/local/lib/ruby/gems/1.8/gems/vanity-1.2.0/lib/vanity/rails/helpers.rb:91:in `ab_test'

[assaf]

Thanks. This seem unrelated to load, simply a bug in the choose method of AbTest that calls identify instead of identity. Fixing now.