[PATCH 3 of 3 STABLE] mail: black wants to add this blank line

[Augie Fackler]

# HG changeset patch
# User Augie Fackler <augie at google.com>
# Date 1572467958 14400
#      Wed Oct 30 16:39:18 2019 -0400
# Branch stable
# Node ID 8ab6c4d652ee5ec4ec3e386261067a236385a53f
# Parent  4ec0fed0eeeb1e8c1a7cd7041325d4733e26016a
mail: black wants to add this blank line

I can't figure out how this got overlooked on previous runs, but here
we are. It looks like the culprit change is already public?

diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -445,6 +445,7 @@ if pycompat.ispy3:
         ep = email.parser.BytesParser()
         return ep.parsebytes(data)
 
+
 else:
 
     Generator = email.generator.Generator