[evolution-data-server] Remove the key if the value is NULL.

[Chenthill Palanisamy <pchen src gnome org>]

commit 11efe67979ab5589f204b50deda90c0edeefe7ab
Author: Chenthill Palanisamy <pchenthill novell com>
Date:   Thu Sep 9 12:07:10 2010 +0530

    Remove the key if the value is NULL.

 calendar/libedata-cal/e-cal-backend-file-store.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/calendar/libedata-cal/e-cal-backend-file-store.c b/calendar/libedata-cal/e-cal-backend-file-store.c
index 0c4b860..0fe0017 100644
--- a/calendar/libedata-cal/e-cal-backend-file-store.c
+++ b/calendar/libedata-cal/e-cal-backend-file-store.c
@@ -381,10 +381,14 @@ e_cal_backend_file_store_put_key_value (ECalBackendStore *store, const gchar *ke
 
 	g_static_rw_lock_writer_lock (&priv->lock);
 
-	if (e_file_cache_get_object (priv->keys_cache, key))
-		ret_val = e_file_cache_replace_object (priv->keys_cache, key, value);
-	else
-		ret_val = e_file_cache_add_object (priv->keys_cache, key, value);
+	if (!value)
+		ret_val = e_file_cache_remove_object (priv->keys_cache, key);
+	else {
+		if (e_file_cache_get_object (priv->keys_cache, key))
+			ret_val = e_file_cache_replace_object (priv->keys_cache, key, value);
+		else
+			ret_val = e_file_cache_add_object (priv->keys_cache, key, value);
+	}
 
 	g_static_rw_lock_writer_unlock (&priv->lock);