[PATCH v2] dispatch: refactor tortured debugger setup logic

[Bryan O'Sullivan]

On Tue, Jan 5, 2016 at 5:53 AM, Yuya Nishihara <yuya at tcha.org> wrote:

> "--config ui.debugger=" will raise ValueError: Empty module name.
>

I don't think we should care about that.


> And debugmod could be unbound.
>

This I just fixed, thanks.
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