Failed: NoMethodError: undefined method `each' for nil:NilClass

[greyblake]

Steps to reproduce

Run in root rails application directory:

bundle exec erd

Backrace

/rails-erd-1.0.0/lib/rails_erd/cli.rb:130:in `start': undefined method `[]' for nil:NilClass (NoMethodError)
/rails-erd-1.0.0/lib/rails_erd/cli.rb:116:in `start'
/rails-erd-1.0.0/bin/erd:4

Environment

Rails: 3.2.6
Ruby: ruby 1.8.7, REE 2012.02
DB: PostgreSQL 9.1
ERD: RailsERD 1.0.0
OS: Linux 2.6.32-5-amd64, Debian GNU/Linux 6.0.1

[greyblake]

rake erd

works fine.