Upgrade/Install: Prevent possible JavaScript error when updating translations.

Props Presskopp.
Fixes #39189.

Built from https://develop.svn.wordpress.org/trunk@44513


git-svn-id: http://core.svn.wordpress.org/trunk@44344 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-upgrader-skin.php

@@ -191,7 +191,7 @@ class WP_Upgrader_Skin {
 		} else {
 			echo '<script type="text/javascript">
 					(function( wp ) {
-						if ( wp && wp.updates.decrementCount ) {
+						if ( wp && wp.updates && wp.updates.decrementCount )
 							wp.updates.decrementCount( "' . $type . '" );
 						}
 					})( window.wp );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44512';
+$wp_version = '5.1-alpha-44513';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.