From: David Bremner <david@tethera.net>
Date: Fri, 24 Mar 2017 22:52:51 +0000 (-0300)
Subject: lib: handle empty string in regexp field processors
X-Git-Tag: 0.24.1~8
X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=commitdiff_plain;h=cb84f8487833c19ce13edb769fa6421547077725;hp=cb84f8487833c19ce13edb769fa6421547077725

lib: handle empty string in regexp field processors

The non-field processor behaviour is is convert the corresponding
queries into a search for the unprefixed terms. This yields pretty
surprising results so I decided to generate a query that would match
the terms (i.e. none with that prefix) generated for an empty header.
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