From 8aa379ef9ee7c954124a2e62281a253b1452ee9b Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Tue, 18 Oct 2022 07:35:47 -0400
Subject: [PATCH] Fix argument-less :watch-attr() procedural operator

It's valid to have no argument for `:watch-attr()`.
---
 src/js/static-filtering-parser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index b73035b40..0b47b0bf4 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1977,7 +1977,7 @@ Parser.prototype.SelectorCompiler = class {
     }
 
     compileAttrList(s) {
-        if ( s === '' ) { return; }
+        if ( s === '' ) { return s; }
         const attrs = s.split('\s*,\s*');
         const out = [];
         for ( const attr of attrs ) {