running herbgobbler a second time in the same application crashes

[ceigel]

Repro.
run herbgobbler once.
run it again

/usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/rails_translation_store.rb:91:in escape': undefined methodgsub' for nil:NilClass (NoMethodError)
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/rails_translation_store.rb:74:in block in serialize' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/base_translation_store.rb:14:inblock (2 levels) in each'
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/base_translation_store.rb:12:in each' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/base_translation_store.rb:12:inblock in each'
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/base_translation_store.rb:11:in each' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/base_translation_store.rb:11:ineach'
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/core/rails_translation_store.rb:55:in serialize' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/commandline/gobble_all.rb:64:inblock in execute_i18n'
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/commandline/gobble_all.rb:64:in open' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/commandline/gobble_all.rb:64:inexecute_i18n'
from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/lib/commandline/gobble_all.rb:17:in execute' from /usr/local/lib/ruby/gems/2.1.0/gems/herbgobbler-0.3.11/bin/gobble:32:in<top (required)>'
from /usr/local/bin/gobble:23:in load' from /usr/local/bin/gobble:23:in

'