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 28 minutes and 39 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Build
passed #76445
build

00:06:08

passed #76450
build_android

00:01:57

passed #76446
build_clang_libcpp

00:04:31

passed #76449
build_clazy

00:04:08

passed #76447
build_gcc_49

00:07:46

passed #76448
build_mingw64_fedora

00:04:05