[PATCH v5] quartz: Handle NULL visible in, IVideoWindow::get_Visible().

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=78371

Your paranoid android.

=== w10pro64_ja (32 bit report) ===

quartz:
videorenderer.c:1098: Test failed: Got hr 0x80004005.

=== w10pro64_zh_CN (32 bit report) ===

quartz:
videorenderer.c:1088: Test failed: Thread should block in Receive().

=== w10pro64 (64 bit report) ===

quartz:
videorenderer.c:2133: Test failed: Got unexpected status 0.
videorenderer.c:2136: Test failed: Wait timed out.
videorenderer.c:2144: Test failed: Got unexpected status 0x400040.

=== w10pro64_2scr (64 bit report) ===

quartz:
videorenderer.c:1098: Test failed: Got hr 0x80004005.

=== w10pro64_he (64 bit report) ===

quartz:
videorenderer.c:1088: Test failed: Thread should block in Receive().

=== w10pro64_zh_CN (64 bit report) ===

quartz:
videorenderer.c:2144: Test failed: Got unexpected status 0x400040.