mshtml: Check for the container's doc being NULL in nsTooltipListener_OnShowTooltip and nsTooltipListener_OnHideTooltip.

[Rob Shearman]

They could be called after NSContainer_Release is called.
---
 dlls/mshtml/nsembed.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
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