Empty push_trigger should count as "translated" and "reviewed"

[joelanders]

From the readme:

        # This can be 'translated' or 'reviewed'. To catch both actions,
        # simply remove this key.
        push_trigger: "translated"

From my logs:

 INFO -- : did not process changes because trigger was 'translated' and push trigger was set to ''

My txgh.yml:

push_trigger: "<%= ENV['TX_PUSH_TRIGGER_REVIEWED_OR_TRANSLATED'] %>"

And that^ environment variable is unset in Heroku.