Check if node is still existing in "nodereference_count_update_count()" to prevent exceptions

Firstofall let me thank you for your good an hard work in this module. It works great!

In some edge-cases I have a major problem causing Exceptions and breaking the site.
The reason and fix is quite simple:

Context:
Deleting nodes or updating deleted nodes.

Problem:
The following function does not check if the (loaded) node truely exists. If node_load returns FALSE (means: node no more existing), the function simply proceeds, which leads to an Exception in includes/common.inc: "Missing bundle property on entity of type node" (Line 7765).

function nodereference_count_update_count($nid) {
  $node = node_load($nid);
  field_attach_presave('node', $node);
  field_attach_update('node', $node);
}

Solution: Simply check if the node exists:

function nodereference_count_update_count($nid) {
  $node = node_load($nid);
  if($node !== FALSE) {
    field_attach_presave('node', $node);
    field_attach_update('node', $node);
  }
}

The solution was tested successfully and has no risk.