rake bugsnag:heroku:add_deploy_hook fails on empty env vars

[joelcogen]

If you have an empty env var, it will output like this in heroku config:

MY_VAR=

(reproduce with heroku config:set MY_VAR=).

lib/bugsnag/tasks/bugsnag.rake:51 does this:

k,v = c.split("=")
obj[k] = v.strip.empty? ? nil : v

but the result of split in this case is ["MY_VAR"], so v is nil, and strip isn't defined on nil.

Maybe add:

next if v.nil?

between the two lines, or change the test to

obj[k] = (v.nil? || v.strip.empty?) ? nil : v

[kattrali]

Thanks for the report @joelcogen. Just pushed a fix, and will make a release soon.