Certain emails with a space in the Content-type from sakai are causing Horde/Imp to not display them

Some emails from sakai cannot be displayed in Horde because of a extra space in the Content-type field in the email header.

Here is an example that came from the Assignment tool:

Subject: Email notification for assignment submission
Content-Type: text/plain ; charset=iso-8859-1

There is a space after the "text/plain" and before the semicolon.

There is a patch attached to fix this.