[pve-devel] [PATCH manager] ext6migrate: fix model behaviour for KVComboBox

[Dietmar Maurer]

> we used an empty value for the Key-Value ComboBox for defaults.
> With extjs6, if the idProperty of a model is empty, they generate
> a name for it, which breaks our logic for submitting
> (currently we checked if this is empty, and send a delete command
> to our api)
> instead, we use the value 'default' and check for it when we submit

maybe __default__ (to avoid possible conflicts)