Prevent crash if DescriptorScale#labels are not provided

4 jobs for 289-descriptor-details-problem in 3 minutes and 31 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Package
passed package the branch #15689

00:03:09

 
  Dockerize
manual deploy for review #15691
allowed to fail manual
passed dockerize the branch #15690

00:00:22

manual remove review instance #15692
allowed to fail manual