[PATCH 1/2] tag: Disallow adding malformed tags to messages

[David Bremner]

Austin Clements <amdragon at MIT.EDU> writes:

> This disallows adding empty tags, since nothing but confusion follows
> in their wake, and disallows adding tags that begin with "-" because
> they are also confusing, the tag "-" is impossible to remove using the
> CLI, and because the syntax for removing such tags conflicts with long
> argument syntax.

Pushed both,

d