Setting Permalink to empty (aka, permalink to root), defaults to slugified title on Update

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Reason for this issue

Expected behaviour should be letting me set the permalink to / (aka empty) or write an error explaining why it's not possible (the issue is present even when there are no paths set to /)

Steps to Reproduce

1. Create a new page
2. Set permalink to empty

[bppdddqqqq]

The issue seems to stem from the onEvent "save-post" callback located in @factor/post/el/permalink.vue.

if (!this.value && this.post.title) { this.emit(this.post.title) }

It evaluates the permalink string and if it's falsy, it emits the title as a new permalink.

One of the falsy evaluations is an empty string, which results into this behaviour.