Add condition to not notify slack when don't have files in dags folder

[ilitotor]

Fixes

Fixes WordPress/openverse#1408 785 by @AetherUnbound

Description

This PR gets the last git log and checks if have files inside the dags folder to notify slack.

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[AetherUnbound]

Thank you for submitting this PR @ilitotor! This is a great approach. It looks like the linting is failing, I think the proposed suggestion below should address the issue 😄

[AetherUnbound]

The new changes look great, but apologies, one more thing before this is ready!

[AetherUnbound]

One more change I just realized (sorry!), this should go after the git reset --hard "$new" line below. If we don't move forward on each commit, $new will always be the next commit ahead and we will run into the same loop of logic for skipping it if it happens to not include DAGs. We only want to exit prior to sending the Slack notification if there aren't any DAGs.

[krysal]

Looks good. Thank you for this valuable contribution to the Openverse's catalog @ilitotor!

[AetherUnbound]

Looks great, congrats on your first contribution! 😄