Index: wp-includes/class-wp-customize-widgets.php
===================================================================
--- wp-includes/class-wp-customize-widgets.php	(revision 38764)
+++ wp-includes/class-wp-customize-widgets.php	(working copy)
@@ -729,7 +729,7 @@
 				'error'            => __( 'An error has occurred. Please reload the page and try again.' ),
 				'widgetMovedUp'    => __( 'Widget moved up' ),
 				'widgetMovedDown'  => __( 'Widget moved down' ),
-				'noAreasRendered'  => __( 'There are no widget areas currently rendered in the preview. Navigate in the preview to a template that makes use of a widget area in order to access its widgets here.' ),
+				'noAreasRendered'  => __( 'There are no widget areas on the page shown, however other pages in this theme have them.' ),
 				'reorderModeOn'    => __( 'Reorder mode enabled' ),
 				'reorderModeOff'   => __( 'Reorder mode closed' ),
 				'reorderLabelOn'   => esc_attr__( 'Reorder widgets' ),