[evolution/kill-bonobo] Bug #540269 - Do not crash in em_format_is_attachment

[Matthew Barnes <mbarnes src gnome org>]

commit 4a904bb36ba977e4914cc29f9d1866b15f19e341
Author: Milan Crha <mcrha redhat com>
Date:   Wed May 27 15:15:28 2009 +0200

    Bug #540269 - Do not crash in em_format_is_attachment
    
    Check if part contains data wrapper before accessing its members.
---
 em-format/em-format.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/em-format/em-format.c b/em-format/em-format.c
index 8f2046c..585b611 100644
--- a/em-format/em-format.c
+++ b/em-format/em-format.c
@@ -1004,6 +1004,9 @@ gint em_format_is_attachment(EMFormat *emf, CamelMimePart *part)
 	/*CamelContentType *ct = camel_mime_part_get_content_type(part);*/
 	CamelDataWrapper *dw = camel_medium_get_content_object((CamelMedium *)part);
 
+	if (!dw)
+		return 0;
+
 	/*printf("checking is attachment %s/%s\n", ct->type, ct->subtype);*/
 	return !(camel_content_type_is (dw->mime_type, "multipart", "*")
 		 || camel_content_type_is(dw->mime_type, "application", "x-pkcs7-mime")