If the MIME-continuation line returns nothing, then we should return not

segfault.

(A minor change to Jeff's patch is that we ignore the EBCDIC code path.)

Submitted by:	Jeff Trawick
Reviewed by:	Justin Erenkrantz


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93269 13f79535-47bb-0310-9956-ffa450edef68