After [34374], ensure that `$iptc` is defined.

See #33772.

Built from https://develop.svn.wordpress.org/trunk@34378


git-svn-id: http://core.svn.wordpress.org/trunk@34342 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/image.php

@@ -280,6 +280,7 @@ function wp_read_image_metadata( $file ) {
 		'keywords' => array(),
 	);
 
+	$iptc = array();
 	/*
 	 * Read IPTC first, since it might contain data not available in exif such
 	 * as caption, description etc.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34377';
+$wp_version = '4.4-alpha-34378';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.