Index: wp-admin/network/themes.php
===================================================================
--- wp-admin/network/themes.php	(revision 37690)
+++ wp-admin/network/themes.php	(working copy)
@@ -236,10 +236,10 @@
 
 <div class="wrap">
 <h1><?php echo esc_html( $title ); if ( current_user_can('install_themes') ) { ?> <a href="theme-install.php" class="page-title-action"><?php echo esc_html_x('Add New', 'theme'); ?></a><?php }
-if ( isset( $_REQUEST['s'] ) && strlen( $_REQUEST['s'] ) ) {
-	/* translators: %s: search keywords */
-	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $s ) );
-}
+$s = trim( $s ); 
+if ( ! empty( $s ) ) { 
+ 		printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $s ) ); ?> 
+} 
 ?>
 </h1>
 
Index: wp-admin/plugins.php
===================================================================
--- wp-admin/plugins.php	(revision 37690)
+++ wp-admin/plugins.php	(working copy)
@@ -482,9 +482,9 @@
 <?php
 }
 
-if ( strlen( $s ) ) {
-	/* translators: %s: search keywords */
-	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( urldecode( $s ) ) );
+$s = trim( $s ); 
+ 	if ( ! empty( $s ) ) { 
+ 			printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $s ) ); ?> 
 }
 ?>
 </h1>
Index: wp-admin/users.php
===================================================================
--- wp-admin/users.php	(revision 37690)
+++ wp-admin/users.php	(working copy)
@@ -489,10 +489,10 @@
 	<a href="<?php echo admin_url( 'user-new.php' ); ?>" class="page-title-action"><?php echo esc_html_x( 'Add Existing', 'user' ); ?></a>
 <?php }
 
-if ( strlen( $usersearch ) ) {
-	/* translators: %s: search keywords */
-	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $usersearch ) );
-}
+$s = trim( $usersearch ); 
+if ( ! empty( $usersearch ) ) { 
+		printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $usersearch ) ); ?> 
+} 
 ?>
 </h1>