Remove unnecessary checks before setting $wp_settings_* arrays. Adds unit test for setting a nonexistent variable to a multi-dimensional array.

Props scribu.
Fixes #17884.



git-svn-id: https://develop.svn.wordpress.org/trunk@25240 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/basic.php

@@ -88,4 +88,15 @@ EOF;
 EOF;
 		$this->assertEquals($expected, mask_input_value($in));
 	}
+
+	function test_setting_nonexistent_arrays() {
+		$page = 1;
+		$field = 'settings';
+
+		error_reporting( -1 );
+
+		$empty_array[$page][$field] = 'foo';
+
+		unset( $empty_array[$page]['bar']['baz'] );
+	}
 }