[Tickets #2070] IMP fails showing MIME Mails if some MIME type is unknown

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Ticket URL: http://bugs.horde.org/ticket/?id=2070
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 Ticket             | 2070
 Updated By         | thomas at gelf.net
 Summary            | IMP fails showing MIME Mails if some MIME type is unknown
 Queue              | Horde Framework Packages
 State              | Feedback
 Priority           | 2. Medium
 Type               | Bug
 Owners             | 
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thomas at gelf.net (2005-06-02 15:55) wrote:

Error msg:
Fatal error: Call to a member function on a non-object in
/usr/share/php/Horde/MIME/Contents.php on line 438

This error is from canDisplayInline(), the problem is that 

    $viewer = &$this->getMIMEViewer($mime_part);

probably returns just "false" and not a MIME_Viewer Object if mimetype is
unknown. 

Example attachment causing this error:

mime_part Object:
    [_type] => audio
    [_subtype] => x-wav
    [_description] => Voicemail sound attachment.
    ...

My patch adds a check for this and also fixes partSummary() - the same
problem occurs there when 

    $viewer->getIcon()

is called.

Cheers,
Thomas Gelf