In `get_post_class()`, ensure that we always coerce the class list passed to the function to an array, even when it's empty.

This is consistent with `get_body_class()`, see [18176].

See #34452.
Built from https://develop.svn.wordpress.org/trunk@35399


git-svn-id: http://core.svn.wordpress.org/trunk@35363 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-template.php

@@ -429,6 +429,9 @@ function get_post_class( $class = '', $post_id = null ) {
 			$class = preg_split( '#\s+#', $class );
 		}
 		$classes = array_map( 'esc_attr', $class );
+	} else {
+		// Ensure that we always coerce class to being an array.
+		$class = array();
 	}
 
 	if ( ! $post ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-beta1-35398';
+$wp_version = '4.4-beta1-35399';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.