jscript: Properly handle NULL bstr in str_to_number

[Jacek Caban]

---
 dlls/jscript/jsutils.c     |    5 +++++
 dlls/jscript/tests/lang.js |    4 +++-
 dlls/jscript/tests/run.c   |   28 ++++++++++++++++++++++++----
 3 files changed, 32 insertions(+), 5 deletions(-)


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