Cast to array in upgrade foreach(). props arnee. fixes #5047

git-svn-id: http://svn.automattic.com/wordpress/trunk@6158 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/upgrade.php

@@ -1012,7 +1012,7 @@ function dbDelta($queries, $execute = true) {
 				}
 
 				// For every remaining index specified for the table
-				foreach($indices as $index) {
+				foreach ( (array) $indices as $index ) {
 					// Push a query line into $cqueries that adds the index to that table
 					$cqueries[] = "ALTER TABLE {$table} ADD $index";
 					$for_update[$table.'.'.$fieldname] = 'Added index '.$table.' '.$index;