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.
10 jobs for master in 46 minutes and 18 seconds (queued for 9 seconds)
Status Name Job ID Coverage
  Build
passed build #186733

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passed build_android #186738

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passed build_clang_libcpp #186734

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passed build_clazy #186737

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passed build_gcc_49 #186735

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passed build_mingw64_fedora #186736

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  Document
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passed glib_docs #186741

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passed qt5_docs #186739

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  Publish
passed trigger_pages #186742

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