Fix GH-8750: Can not create VT_ERROR variant type #8840
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Despite the current documentation claiming that
variant::__construct()
would allow to create
VT_ERROR
variants, that is not possible. It isnot even clear whether this would be desirable, so we introduce
variant::createError()
which explicitly allows to do this.We also introduce
DISP_E_PARAMNOTFOUND
which might be the mostimportant
scode
for this purpose, since this allows to skip optionalparameters in method calls.