[vbox-dev] No delete via SetExtraData() set to QString::null ?

[Huihong Luo]

it seems set the extra data to empty string, instead of deleting it
 
for example,
 
cmachine.SetExtraData (VBoxDefs::GUI_FirstRun, QString::null);
 
inside xml:
 
<ExtraDataItem name="GUI/FirstVMLiteRun" value="" /> 
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