Autocomplete ValueProvider is not invoked when argument have empty name

[Antoniossss]

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Using shell 2.0.0.RELEASE

My shell method looks like this

    @ShellMethod(key = "ctx instance", value = "Gets or sets currently selected instance")
    public void currentInstance(@ShellOption(value = {""}, valueProvider = MyProvider.class, defaultValue = ShellOption.NULL)
                                        MyInstance instance) {

Now the goal of empty name is to allow for following invocations to work

ctx instance ctx instance someValue

so the first variant is "read" and second is for writing.

However, in such configuration TAB does not invoke MyProvider provider. It works as expected if @ShellOption (value={"someParam"}) is given with an exception that argument must be named now.