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 13 minutes and 55 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #100751
build

00:04:50

passed #100756
build_android

00:01:24

passed #100752
build_clang_libcpp

00:04:27

passed #100755
build_clazy

00:05:09

passed #100753
build_gcc_49

00:08:59

passed #100754
build_mingw64_fedora

00:13:54