[evolution] Bug #705657 - Crash in em_utils_selection_set_urilist()

[Milan Crha <mcrha src gnome org>]

commit 8cbeb646cf77bacb55acc2f1912a0afd2fc5a0e3
Author: Milan Crha <mcrha redhat com>
Date:   Thu Aug 8 10:53:31 2013 +0200

    Bug #705657 - Crash in em_utils_selection_set_urilist()

 mail/em-utils.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/mail/em-utils.c b/mail/em-utils.c
index 0b65b63..749d3d1 100644
--- a/mail/em-utils.c
+++ b/mail/em-utils.c
@@ -952,6 +952,12 @@ em_utils_selection_set_urilist (GtkSelectionData *data,
        gchar *save_file_format;
        gboolean save_as_mbox;
 
+       g_return_if_fail (uids != NULL);
+
+       /* can be 0 with empty folders */
+       if (!uids->len)
+               return;
+
        tmpdir = e_mkdtemp ("drag-n-drop-XXXXXX");
        if (tmpdir == NULL)
                return;