Added handling for when the user is ^ responding to a post that gets deleted

web/react/components/create_post.jsx

@@ -92,7 +92,13 @@ module.exports = React.createClass({
                 }.bind(this),
                 function(err) {
                     var state = {}
-                    state.server_error = err.message;
+
+                    if (err.message === "Invalid RootId parameter") {
+                        if ($('#post_deleted').length > 0) $('#post_deleted').modal('show');
+                    } else {
+                        state.server_error = err.message;
+                    }
+
                     state.submitting = false;
                     this.setState(state);
                 }.bind(this)