urlmon: CreateUri should return E_INVALIDARG for NULL args.

[Thomas Mullaly]

CreateUri returns E_INVALIDARG if the IUri or URI string it receives is
NULL.

Test results:
https://testbot.winehq.org/JobDetails.pl?Key=2039

---
 dlls/urlmon/tests/uri.c |   23 ++++++++++++++++++++++-
 dlls/urlmon/uri.c       |    8 ++++++++
 2 files changed, 30 insertions(+), 1 deletions(-)
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