Joffrey JAFFEUX 644441852e
FIX: prevents exception on malformatted messages (#13997)
The following example message would generate an exception:

```
Return-Path: <discourse@bar.com>
From: Foo Bar <discourse@bar.com>
To: reply+4f97315cc828096c9cb34c6f1a0d6fe8@bar.com
Date: Fri, 15 Jan 2016 00:12:43 +0100
Message-ID: <21@foo.bar.mail>
Mime-Version: 1.0
Content-Type: text/html; charset=UTF-8

</div>

```

Exception:

```
NoMethodError:
       undefined method `split' for nil:NilClass
```
2021-08-10 15:49:32 +02:00
..
2020-01-15 11:27:12 +01:00
2020-05-05 13:46:57 +10:00
2021-05-31 10:22:50 +08:00
2020-05-05 13:46:57 +10:00
2021-06-21 11:06:58 +08:00
2020-07-21 15:55:03 +08:00
2020-04-30 16:48:53 +10:00