Internal error in rake tasks

````
> be rake --tasks
rake aborted!
NoMethodError: undefined method `full_comment' for nil:NilClass
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/bower-rails-0.7.2/lib/tasks/helpers/before_hook.rb:7:in `block in before'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/bower-rails-0.7.2/lib/tasks/helpers/before_hook.rb:5:in `each'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/bower-rails-0.7.2/lib/tasks/helpers/before_hook.rb:5:in `before'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/bower-rails-0.7.2/lib/tasks/bower.rake:56:in `<top (required)>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `load'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `block in load'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:236:in `load_dependency'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `load'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/bower-rails-0.7.2/lib/bower-rails/railtie.rb:28:in `block in <class:Railtie>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/railtie.rb:194:in `instance_exec'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/railtie.rb:194:in `block in load_tasks'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/railtie.rb:194:in `each'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/railtie.rb:194:in `load_tasks'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/engine.rb:423:in `block in load_tasks'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/application/railties.rb:8:in `each'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/application/railties.rb:8:in `all'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/engine.rb:423:in `load_tasks'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/application.rb:145:in `load_tasks'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/railtie/configurable.rb:30:in `method_missing'
/home/kikonen/work/projects/sampler/test/dummy/Rakefile:7:in `<top (required)>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/tasks/engine.rake:3:in `load'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/tasks/engine.rake:3:in `block (2 levels) in <top (required)>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/tasks/engine.rake:2:in `block in <top (required)>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/gems/railties-3.2.17/lib/rails/tasks/engine.rake:72:in `<top (required)>'
/home/kikonen/work/projects/sampler/Rakefile:24:in `load'
/home/kikonen/work/projects/sampler/Rakefile:24:in `<top (required)>'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/bin/ruby_executable_hooks:15:in `eval'
/home/kikonen/.rvm/gems/ruby-1.9.3-p484@sampler/bin/ruby_executable_hooks:15:in `<main>Tasks: TOP => load_app
(See full trace by running task with --trace)

> grep bower Gemfile.lock
    bower-rails (0.7.2)
  bower-rails

> grep rake Gemfile.lock
      rake (>= 0.8.7)
    rake (10.3.1)
  rake
````