Fix regression with oddball charsets

Fix the same bug we've fixed before in another place -- when charset is
set to oddball value like charset=a, fallback to utf-8 and hope for the
best.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/b4/__init__.py b/b4/__init__.py
index 85073e2..641cc70 100644
--- a/b4/__init__.py
+++ b/b4/__init__.py
@@ -851,6 +851,7 @@ class LoreMessage:
                 # Whatever, we'll use utf-8 and hope for the best
                 payload = payload.decode('utf-8', errors='replace')
                 part.set_param('charset', 'utf-8')
+                self.charset = 'utf-8'
             if self.body is None:
                 self.body = payload
                 continue