wininet: HTTP_Connect should fail if a NULL or empty hostname is passed in.

[Robert Shearman]

Add tests for these circumstances.
---
  dlls/wininet/http.c       |    6 ++++++
  dlls/wininet/tests/http.c |   12 +++++++++++-
  2 files changed, 17 insertions(+), 1 deletions(-)
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