ConvertStringSecurityDescriptorToSecurityDescriptor - more tests (pass)

[Paul Bryan Roberts]

Third attempt.

Fix to ParseStringAclToAcl() to set missing error code - fix one todo_wine.

New tests to check effects of passing NULL parameters/empty strings to 
ConvertStringSecurityDescriptorToSecurityDescriptor.

New tests and fix submitted together since
passing NULL to W-form crashed Wine test program.

Extra check in ConvertStringSecurityDescriptorToSecurityDescriptorW()
to fix crash.  Fixes all but one of the new tests.

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