[anjal] Fix up a crash.

[Srinivasa Ragavan <sragavan src gnome org>]

commit 47fac95990a8539d9223d94ff94ff65b6a898738
Author: Srinivasa Ragavan <sragavan novell com>
Date:   Fri May 29 00:22:03 2009 +0530

    Fix up a crash.
---
 src/em-tree-store.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/em-tree-store.c b/src/em-tree-store.c
index 5d06f7c..a60ce99 100644
--- a/src/em-tree-store.c
+++ b/src/em-tree-store.c
@@ -1043,7 +1043,8 @@ emts_folder_changed_idle(void *data)
 			EMTreeNode *node;
 
 			mi = camel_folder_get_message_info (f->folder, uid);			
-
+			if (!mi)
+				continue;
 			if ((node = g_hash_table_lookup(f->uid_table, camel_message_info_uid(mi)))) {
 				GtkTreeIter iter;
 				GtkTreePath *path;