Fix broken parser involving specific filters with Unicode characters

Related feedback:
- https://www.reddit.com/r/uBlockOrigin/comments/10obivd/

The issue was arising with filters of the form:

    ||example.org^$domain=[domain name with Unicode characters]

src/js/static-filtering-parser.js

@@ -1189,7 +1189,7 @@ export class AstFilterParser {
                 parentEnd - 1
             );
             this.addNodeToRegister(NODE_TYPE_NET_PATTERN, next);
-            if ( normal !== pattern ) {
+            if ( normal !== undefined && normal !== pattern ) {
                 this.setNodeTransform(next, normal);
             }
             prev = this.linkRight(prev, next);