[PATCH 0/1] MR8084: comctl32/taskdialog: Protect WM_COMMAND handler from partially initialized dialog.

[Nikolay Sivov (＠nsivov)]

It's possible to get WM_COMMAND(BN_CLICKED) during initialization in taskdialog_init(),
when window property is not yet set. Exceptions are swallowed on win32u transition.

Signed-off-by: Nikolay Sivov