don't display notifications with empty format

dunst.c

@@ -966,7 +966,12 @@ int init_notification(notification * n, int id)
                 close_notification_by_id(id, -1);
         }
 
-        l_push(notification_queue, n);
+        if(strlen(n->msg) == 0) {
+                close_notification(n, 2);
+                printf("skipping notification: %s %s\n", n->body, n->summary);
+        } else {
+                l_push(notification_queue, n);
+        }
 
         return n->id;
 }

dunstrc

@@ -120,6 +120,13 @@
 # and you can override the 'timeout', 'urgency', 'foreground', 'background'
 # and 'format'.
 # Shell-like globbing will get expanded.
+#
+# NOTE: if you don't want a notification to be displayed, set the format to ""
+
+#[ignore]
+## This notification will not be displayed
+#    summary = "foobar"
+#    format = ""
 
 #[signed_on]
 #    appname = Pidgin
@@ -140,3 +147,4 @@
 #    appname = Pidgin
 #    summary = *twitter.com*
 #    urgency = normal
+#