Inverts condition when setting RAILS_DB in hook

This looks like silly error but myabe I am not right.

Why test if set_env_var is function and use it when it is not?

With original condition I cannot find RAILS_DB file at $RAILS_DB $OPENSHIFT_HOMEDIR/.env/user_vars directory and running rails c when sshed into gear show that rails connects to sqlite in both development and production envs despite fact that I have MySQL running.

Removing negation in this condition causes RAILS_DB env variable to be present and correctly filled accordind to what db is running and rails c show that it connects to correct db.