fix check for thumbnail object existence

4 jobs for 0.7.3 in 4 minutes and 4 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #76182
mbr
test

00:01:50

passed #76183
mbr
test-chart

00:00:12

 
  Publish
passed #76184
mbr
build-tagged-image

00:02:13

passed #76185
mbr
publish-chart

00:00:13