[pkg-horde] Bug#416577: imp4: PHP error when reporting multiple messages as spam

[Lee Aylward]

Apologies, I forgot to paste the warning message:

Warning: Invalid argument supplied for foreach() in  
/usr/share/horde3/imp/lib/MIME/Headers.php on line 134

The diff attached to the previous report patches Headers.php to fix  
the warning.

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