fix RGAA 5.4 requires arrays to have defined captions (#2356)

5 jobs for v2.0 in 20 minutes and 8 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Build
passed #32918
build_bionic

00:04:02

passed #32917
build_buster

00:02:57

passed #32919
build_centos_7

00:05:45

passed #32920
build_centos_8

00:03:22

passed #32916
build_stretch

00:04:00