[evolution] Fix invalid read on vCard drop

[Milan Crha <mcrha src gnome org>]

commit a6830da67d0af30d44774879df1a9b06bf23641d
Author: Milan Crha <mcrha redhat com>
Date:   Tue Oct 18 11:12:16 2011 +0200

    Fix invalid read on vCard drop

 addressbook/util/eab-book-util.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/addressbook/util/eab-book-util.c b/addressbook/util/eab-book-util.c
index 9839e51..eff5fc1 100644
--- a/addressbook/util/eab-book-util.c
+++ b/addressbook/util/eab-book-util.c
@@ -106,7 +106,8 @@ eab_contact_list_from_string (const gchar *str)
 
 			q += 9;
 			temp = q;
-			temp += strspn (temp, "\r\n\t ");
+			if (*temp)
+				temp += strspn (temp, "\r\n\t ");
 
 			if (*temp == '\0' || !g_ascii_strncasecmp (temp, "BEGIN:VCARD", 11))
 				break;  /* Found the outer END:VCARD */