Skip rules without selectors in Styles.getParentRules

src/style_manager/index.ts

@@ -601,10 +601,12 @@ export default class StyleManager extends ItemManagerModule<
       let rules: CssRule[] = [];
 
       const rulesBySelectors = (values: string[]) => {
-        return cssC.getRules().filter(rule => {
-          const rSels = rule.getSelectors().map(s => s.getFullName());
-          return rSels.every(rSel => values.indexOf(rSel) >= 0);
-        });
+        return !values.length
+          ? []
+          : cssC.getRules().filter(rule => {
+              const rSels = rule.getSelectors().map(s => s.getFullName());
+              return !!rSels.length && rSels.every(rSel => values.indexOf(rSel) >= 0);
+            });
       };
 
       // Componente related rule

test/specs/style_manager/index.ts

@@ -213,11 +213,15 @@ describe('StyleManager', () => {
 
       test('Mixed classes', () => {
         const cmp = domc.addComponent('<div class="cls1 cls2"></div>');
-        const [rule1, rule2] = cssc.addRules(`
+        const [a, b, rule1, rule2] = cssc.addRules(`
+          h1 { color: white; }
+          h1 .test { color: black; }
           .cls1 { color: red; }
           .cls1.cls2 { color: blue; }
           .cls2 { color: green; }
           .cls1.cls3 { color: green; }
+          h2 { color: white; }
+          h2 .test { color: black; }
         `);
         em.setSelected(cmp);
         obj.__upSel();