usp10: fix ScriptGetCMap handling of unsupported glyphs

[Aric Stewart]

---
  dlls/usp10/tests/usp10.c |   15 +++++++++++++--
  dlls/usp10/usp10.c       |    9 ++++++++-
  2 files changed, 21 insertions(+), 3 deletions(-)


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