Customize: Hide "Change" button in themes section if there are fewer than two available themes.

Props danielbachhuber, westonruter.
Fixes #34549.

Built from https://develop.svn.wordpress.org/trunk@35535


git-svn-id: http://core.svn.wordpress.org/trunk@35499 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/customize/class-wp-customize-themes-section.php

@@ -46,7 +46,9 @@ class WP_Customize_Themes_Section extends WP_Customize_Section {
 				}
 				?>
 
+				<?php if ( count( $this->controls ) > 1 ) : ?>
 					<button type="button" class="button change-theme" tabindex="0"><?php _ex( 'Change', 'theme' ); ?></button>
+				<?php endif; ?>
 			</h3>
 			<div class="customize-themes-panel control-panel-content themes-php">
 				<h3 class="accordion-section-title customize-section-title">

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-beta3-35534';
+$wp_version = '4.4-beta3-35535';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.