Customizer: Hide help toggle button in panel when no description is supplied.

This aligns with the `.customize-panel-description` element which is also excluded if there is no description.

Props drebbits.web.
Fixes #35540.

Built from https://develop.svn.wordpress.org/trunk@36374


git-svn-id: http://core.svn.wordpress.org/trunk@36341 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-customize-panel.php

@@ -372,7 +372,9 @@ class WP_Customize_Panel {
 					/* translators: %s is the site/panel title in the Customizer */
 					echo sprintf( __( 'You are customizing %s' ), '<strong class="panel-title">{{ data.title }}</strong>' );
 				?></span>
+				<# if ( data.description ) { #>
 					<button class="customize-help-toggle dashicons dashicons-editor-help" tabindex="0" aria-expanded="false"><span class="screen-reader-text"><?php _e( 'Help' ); ?></span></button>
+				<# } #>
 			</div>
 			<# if ( data.description ) { #>
 				<div class="description customize-panel-description">

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36373';
+$wp_version = '4.5-alpha-36374';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.