usp10 (resend): properly handle invalid arguments to ScriptBreak

[Aric Stewart]

now with tests
---
  dlls/usp10/tests/usp10.c |   13 +++++++++++++
  dlls/usp10/usp10.c       |    3 ++-
  2 files changed, 15 insertions(+), 1 deletions(-)


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