apply missing rule

.eslintrc.js

@@ -78,6 +78,7 @@ module.exports = {
         '@eslint-react/dom/no-dangerously-set-innerhtml': 0, // used for for injecting html tags
         '@eslint-react/no-array-index-key': 0,
         '@eslint-react/no-unused-class-component-members': 0, // disabled for ".d.ts" files
+        '@eslint-react/no-leaked-conditional-rendering': 'error', // important ! avoids rendering 0
       },
     },
     {