Fix MWException from AbuseFilterView

The case default was recently added, but didn't take into account that
"false" is valid too. Noticed by chance just before the train rolled
out.

Change-Id: I67ca475fa16ea449820f8c735531c2cc1b0ec975

includes/Views/AbuseFilterView.php

@@ -286,6 +286,9 @@ abstract class AbuseFilterView extends ContextSource {
 					'rc_log_type' => 'delete',
 					'rc_log_action' => 'delete'
 				], LIST_AND );
+			case false:
+				// Done later
+				break;
 			// @ToDo: case 'upload'
 			default:
 				throw new MWException( __METHOD__ . ' called with invalid action: ' . $action );