Merge pull request #1287 from joshfester/fix-buffer-wipeout

Fix buffer wipeout

Author: ikolarov

core/Container/Block_Container.php

@@ -449,9 +449,7 @@ public function render_block( $attributes, $content, $block = null ) { // added
 		unset($attributes['data']);
 		ob_start();
 		call_user_func( $this->render_callback , $fields, $attributes, $content, $post_id, $block );
-		$toReturn = ob_get_contents();
-		ob_clean();
-		return $toReturn;
+		return ob_get_clean();
 	}
 
 	/**