fix RGAA 1.2 criterium: applogo alt image should be empty (ref #2345)

5 jobs for v2.0 in 19 minutes and 38 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #32672
build_bionic

00:03:53

passed #32671
build_buster

00:02:53

passed #32673
build_centos_7

00:05:39

passed #32674
build_centos_8

00:03:18

passed #32670
build_stretch

00:03:53