secur32: NTLM's AcquireCredentialHandleA/W should accept domains and usernames with lengths of 0.

[Robert Shearman]

Add tests for these cases.
---
  dlls/secur32/ntlm.c       |    6 ----
  dlls/secur32/tests/ntlm.c |   69 
+++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 69 insertions(+), 6 deletions(-)
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