Error about "Use of uninitialized value in join or string at template branding/openSUSE/external_reporting.html.ep line 45" on every view of a screenshot of a job that has non-standard flavor, e.g. "Regression-on-migrated-system-from-SLE12-SPx"
Every time someone accesses a screenshot view of a job with a "non-standard" flavor, e.g. https://openqa.suse.de/tests/3240939#step/install_service/5 with flavor "Regression-on-migrated-system-from-SLE12-SPx" an error is reported in logs about
Use of uninitialized value in join or string at template branding/openSUSE/external_reporting.html.ep line 45.