Fix tests when no VERSION file exists

[jcfr]

No description provided.

[jcfr]

@lucasbrunialti Thanks for improving the tests. Our of curiosity, which workflow did you follow to produce the error fixed by this commit ?

[lucasbrunialti]

I followed the steps in here (https://github.com/j0057/github-release#testing):

To execute the integration tests locally, and make sure your awesome contribution is working as expected, you will have to:

• create a test repository with at least one commit (e.g yourname/github-release-test)
• set environment variable INTEGRATION_TEST_REPO_NAME=yourname/github-release-test
• execute python setup.py test

[lucasbrunialti]

Created this repo with a initial commit: https://github.com/lucasbrunialti/github-release-test

[jcfr]

Makes sense. Thanks for the rapid feedback.