fix menu for compiledReact

Author: bradwestfall

preferences.json

@@ -1,5 +1,3 @@
 {
-  "workshop": "react",
-  "course": "advanced-hooks",
-  "compiledReact": false
+  "workshop": "react"
 }

scripts/start.ts

@@ -20,9 +20,10 @@ const preferencesPath = path.resolve(__dirname, '..', 'preferences.json')
 let preferences: Record<string, string | boolean> = {}
 try {
   const data = fs.readFileSync(preferencesPath, 'utf8')
-  preferences = JSON.parse(data)
+  preferences = JSON.parse(data || '{}')
   if (preferences.compiledReact === undefined) {
     preferences.compiledReact = false
+    savePreferences({})
   }
 } catch (err) {
   // no-op