```ruby
require 'pivotal-tracker'

token = ENV['CI'] ? '' : ENV['PIVOTAL_TOKEN']
raise 'No Environment variable PIVOTAL_TOKEN found' unless token
PivotalTracker::Client.token = token
```

Fix error when using empty Pivotal token
user
```ruby
require 'pivotal-tracker'

token = ENV['CI'] ? 'vhTkprGx7CtvotWhwy9NzoWAmpzQisjA' : ENV['PIVOTAL_TOKEN']
raise 'No Environment variable PIVOTAL_TOKEN found' unless token
PivotalTracker::Client.token = token
```
assistant