Prepare conversation deletion in PHP code too

controller/smscontroller.php

@@ -156,6 +156,14 @@ class SmsController extends Controller {
 			"phoneNumbers" => $phoneNumbers, "msgCount" => $msgCount));
 	}
 
+	/**
+	 * @NoAdminRequired
+	 * @NoCSRFRequired
+	 */
+	public function deleteConversation ($contact) {
+		return new JSONResponse(array());
+	}
+
 	/**
 	 * @NoAdminRequired
 	 * @NoCSRFRequired