Avoid having an empty entry in destionation fields

admin/freeposte/admin/models.py

@@ -33,7 +33,7 @@ class CommaSeparatedList(db.TypeDecorator):
         return ",".join(value)
 
     def process_result_value(self, value, dialect):
-        return value.split(",")
+        return filter(bool, value.split(","))
 
 
 class Base(db.Model):
@@ -135,7 +135,7 @@ class User(Email):
 
     # Filters
     forward_enabled = db.Column(db.Boolean(), nullable=False, default=False)
-    forward_destination = db.Column(db.String(255), nullable=True, default=None)
+    forward_destination = db.Column(CommaSeparatedList, nullable=True, default=None)
     reply_enabled = db.Column(db.Boolean(), nullable=False, default=False)
     reply_subject = db.Column(db.String(255), nullable=True, default=None)
     reply_body = db.Column(db.Text(), nullable=True, default=None)