[imp] Small issue after upgrade to HGWE 5.1.4

[Arjen de Korte]

Citeren Michael M Slusarz <slusarz at horde.org>:

> Quoting Arjen de Korte <arjen+horde at de-korte.org>:
>
>> Citeren ANANT S ATHAVALE <asa at isac.gov.in>:
>>
>>> Dear List,
>>>
>>> I just upgraded to HGWE 5.1.4.
>>>
>>> This is my immediate observation and is repeatable in case of a  
>>> mail received from Gmail.
>>>
>>> I am sending a mail from my gmail account to an account which used  
>>> HGWE 5.1.4.  If the subject is blank, the IMP displays Invalid  
>>> Address for 'From' and 'Undisclosed Recipients' for 'To'.  This  
>>> did not happen for mail sent using Yahoo account.
>>>
>>> Can anybody check and confirm this behaviour?
>>
>> Just recently I received a message which was similarly malformed.  
>> When looking at the headers, the only thing that stood out is an  
>> odd looking recipient field:
>>
>>   =?iso-8859-1?Q?Gr=E9_Eveleens?= <user at example.com>,
>
> That's a MIME encoded header.  Nothing wrong there.

That leaves the empty Subject: header, like others also posted in this  
thread. I looked through my whole mail archive and lo-and-behold, all  
messages with an empty Subject: header show this behavior.
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