Themes: Clear floated theme cards on Themes page.

Also maintains visual separation for Broken Themes table on searches that
return no results.

See [36171] for `.wp-clearfix`.

Props 5um17, obenland, valendesigns, afercia.
Fixes #26646.


Built from https://develop.svn.wordpress.org/trunk@36270


git-svn-id: http://core.svn.wordpress.org/trunk@36237 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/themes.css

@@ -9,7 +9,6 @@
 
 .theme-browser .themes {
 	clear: both;
-	padding: 0 0 100px;
 }
 
 .themes-php .wrap h1 {
@@ -1124,13 +1123,15 @@ p.no-themes {
 	font-size: 18px;
 	font-style: normal;
 	margin: 0;
-	padding: 0;
+	padding: 100px 0;
 	text-align: center;
 	display: none;
 }
+
 body.no-results p.no-themes {
 	display: block;
 }
+
 body.show-upload-theme p.no-themes {
 	display: none !important;
 }