Default date arguments set incorrectly when path contains node/%

I ran into an issue with fixed default date arguments while creating some views that use a path containing node/%/

I believe I have located the bug within the views_handler_argument_date.inc file.

The code in the get_default_argument() method checks if the url path contains node/nid and if it does it attempts to load the node.

If it doesn't manage to load a node, default argument types such as default & php will work normally.

However if it does manage to load a node, the method only handles node_created and node_changed argument types correctly.

I have attached a sample view to reproduce this issue, once imported you need to visit a path such as

node/nid/news - replace nid for a valid node id.

As it stands you will get a page not found, unless you specify the argument explicitly such as - node/nid/news/all

With the attached patch, I add a check to see if it needs to even try to load the node - if not it just passes to the parent handler's method.