Description:
------------
I think that is easy to add to core a more detailed debug about errors related with get properties on non objects.

Something like "ErrorException: Trying to get property of non-object" could be more useful with "ErrorException: Trying to get property 'name' of non-object".

Also, related with "Error: Calling function on non-object" as "Error: Calling function 'getName' on non-object".

This change will help to debug problems in conditionals when are using multiples conditions on multiples objects.

Test script:
---------------
<?php
$user = new stdClass;

echo $user->level->name;

// NOW: ErrorException: Trying to get property of non-object
// IMPROVEMENT: ErrorException: Trying to get property 'name' of non-object 'level'