fix(cache): fix cache bug when not painting

Signed-off-by: Guillaume Hivert <[email protected]>

Author: ghivert

src/cache.ffi.mjs

@@ -123,7 +123,7 @@ export class Cache {
   }
 
   #deleteStyles(klass) {
-    klass.indexRules.forEach(indexRule => {
+    klass.indexRules?.forEach(indexRule => {
       this.#stylesheet.deleteRule(indexRule)
     })
   }