Fix bug in master pipeline

Maarten de Waardrequested to merge
573-possible-conflicting-droplet-names-for-multiple-mr-of-the-same-issue into master

As found in https://open.greenhost.net/openappstack/openappstack/-/jobs/41827

UnboundLocalError: local variable 'subdomain' referenced before assignment

Closes #573 (closed)

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