Don't error out if there's no DA in FreeText annotation

We can proceed anyway, hardcoded default values will be used in
AnnotFreeText::generateFreeTextAppearance.
6 jobs from bugfix/freetext_without_da in 21 minutes and 32 seconds (queued for 1 minute and 21 seconds)
Status Job ID Name Coverage
  Build
passed #58276
build

00:05:21

passed #58281
build_android

00:02:10

passed #58277
build_clang_libcpp

00:05:10

passed #58280
build_clazy

00:04:43

passed #58278
build_gcc_49

00:09:32

passed #58279
build_mingw64_fedora

00:04:24