load_template() notice

[idle]

In function load_template() a PHP notice is generated because of an empty array under some circumstances (unknown to me at this point). The line is:

	extract($wp_query->query_vars, EXTR_SKIP);

Fix: Make sure that the passed variable is an array.

	if ( is_array($wp_query->query_vars) ) {
		extract($wp_query->query_vars, EXTR_SKIP);
	}

(In [4777]) Make sure is_array before extract. Props idle. fixes #3626

(In [4778]) Make sure is_array before extract. Props idle. fixes #3626